15 files changed, 4127 insertions, 0 deletions
diff --git a/projects/03/a/Bit.cmp b/projects/03/a/Bit.cmp
new file mode 100644
index 0000000..e900ec7
--- /dev/null
+++ b/projects/03/a/Bit.cmp
@@ -0,0 +1,215 @@
+| time | in  |load | out |
+| 0+   |  0  |  0  |  0  |
+| 1    |  0  |  0  |  0  |
+| 1+   |  0  |  1  |  0  |
+| 2    |  0  |  1  |  0  |
+| 2+   |  1  |  0  |  0  |
+| 3    |  1  |  0  |  0  |
+| 3+   |  1  |  1  |  0  |
+| 4    |  1  |  1  |  1  |
+| 4+   |  0  |  0  |  1  |
+| 5    |  0  |  0  |  1  |
+| 5+   |  1  |  0  |  1  |
+| 6    |  1  |  0  |  1  |
+| 6+   |  0  |  1  |  1  |
+| 7    |  0  |  1  |  0  |
+| 7+   |  1  |  1  |  0  |
+| 8    |  1  |  1  |  1  |
+| 8+   |  0  |  0  |  1  |
+| 9    |  0  |  0  |  1  |
+| 9+   |  0  |  0  |  1  |
+| 10   |  0  |  0  |  1  |
+| 10+  |  0  |  0  |  1  |
+| 11   |  0  |  0  |  1  |
+| 11+  |  0  |  0  |  1  |
+| 12   |  0  |  0  |  1  |
+| 12+  |  0  |  0  |  1  |
+| 13   |  0  |  0  |  1  |
+| 13+  |  0  |  0  |  1  |
+| 14   |  0  |  0  |  1  |
+| 14+  |  0  |  0  |  1  |
+| 15   |  0  |  0  |  1  |
+| 15+  |  0  |  0  |  1  |
+| 16   |  0  |  0  |  1  |
+| 16+  |  0  |  0  |  1  |
+| 17   |  0  |  0  |  1  |
+| 17+  |  0  |  0  |  1  |
+| 18   |  0  |  0  |  1  |
+| 18+  |  0  |  0  |  1  |
+| 19   |  0  |  0  |  1  |
+| 19+  |  0  |  0  |  1  |
+| 20   |  0  |  0  |  1  |
+| 20+  |  0  |  0  |  1  |
+| 21   |  0  |  0  |  1  |
+| 21+  |  0  |  0  |  1  |
+| 22   |  0  |  0  |  1  |
+| 22+  |  0  |  0  |  1  |
+| 23   |  0  |  0  |  1  |
+| 23+  |  0  |  0  |  1  |
+| 24   |  0  |  0  |  1  |
+| 24+  |  0  |  0  |  1  |
+| 25   |  0  |  0  |  1  |
+| 25+  |  0  |  0  |  1  |
+| 26   |  0  |  0  |  1  |
+| 26+  |  0  |  0  |  1  |
+| 27   |  0  |  0  |  1  |
+| 27+  |  0  |  0  |  1  |
+| 28   |  0  |  0  |  1  |
+| 28+  |  0  |  0  |  1  |
+| 29   |  0  |  0  |  1  |
+| 29+  |  0  |  0  |  1  |
+| 30   |  0  |  0  |  1  |
+| 30+  |  0  |  0  |  1  |
+| 31   |  0  |  0  |  1  |
+| 31+  |  0  |  0  |  1  |
+| 32   |  0  |  0  |  1  |
+| 32+  |  0  |  0  |  1  |
+| 33   |  0  |  0  |  1  |
+| 33+  |  0  |  0  |  1  |
+| 34   |  0  |  0  |  1  |
+| 34+  |  0  |  0  |  1  |
+| 35   |  0  |  0  |  1  |
+| 35+  |  0  |  0  |  1  |
+| 36   |  0  |  0  |  1  |
+| 36+  |  0  |  0  |  1  |
+| 37   |  0  |  0  |  1  |
+| 37+  |  0  |  0  |  1  |
+| 38   |  0  |  0  |  1  |
+| 38+  |  0  |  0  |  1  |
+| 39   |  0  |  0  |  1  |
+| 39+  |  0  |  0  |  1  |
+| 40   |  0  |  0  |  1  |
+| 40+  |  0  |  0  |  1  |
+| 41   |  0  |  0  |  1  |
+| 41+  |  0  |  0  |  1  |
+| 42   |  0  |  0  |  1  |
+| 42+  |  0  |  0  |  1  |
+| 43   |  0  |  0  |  1  |
+| 43+  |  0  |  0  |  1  |
+| 44   |  0  |  0  |  1  |
+| 44+  |  0  |  0  |  1  |
+| 45   |  0  |  0  |  1  |
+| 45+  |  0  |  0  |  1  |
+| 46   |  0  |  0  |  1  |
+| 46+  |  0  |  0  |  1  |
+| 47   |  0  |  0  |  1  |
+| 47+  |  0  |  0  |  1  |
+| 48   |  0  |  0  |  1  |
+| 48+  |  0  |  0  |  1  |
+| 49   |  0  |  0  |  1  |
+| 49+  |  0  |  0  |  1  |
+| 50   |  0  |  0  |  1  |
+| 50+  |  0  |  0  |  1  |
+| 51   |  0  |  0  |  1  |
+| 51+  |  0  |  0  |  1  |
+| 52   |  0  |  0  |  1  |
+| 52+  |  0  |  0  |  1  |
+| 53   |  0  |  0  |  1  |
+| 53+  |  0  |  0  |  1  |
+| 54   |  0  |  0  |  1  |
+| 54+  |  0  |  0  |  1  |
+| 55   |  0  |  0  |  1  |
+| 55+  |  0  |  0  |  1  |
+| 56   |  0  |  0  |  1  |
+| 56+  |  0  |  0  |  1  |
+| 57   |  0  |  0  |  1  |
+| 57+  |  0  |  1  |  1  |
+| 58   |  0  |  1  |  0  |
+| 58+  |  1  |  0  |  0  |
+| 59   |  1  |  0  |  0  |
+| 59+  |  1  |  0  |  0  |
+| 60   |  1  |  0  |  0  |
+| 60+  |  1  |  0  |  0  |
+| 61   |  1  |  0  |  0  |
+| 61+  |  1  |  0  |  0  |
+| 62   |  1  |  0  |  0  |
+| 62+  |  1  |  0  |  0  |
+| 63   |  1  |  0  |  0  |
+| 63+  |  1  |  0  |  0  |
+| 64   |  1  |  0  |  0  |
+| 64+  |  1  |  0  |  0  |
+| 65   |  1  |  0  |  0  |
+| 65+  |  1  |  0  |  0  |
+| 66   |  1  |  0  |  0  |
+| 66+  |  1  |  0  |  0  |
+| 67   |  1  |  0  |  0  |
+| 67+  |  1  |  0  |  0  |
+| 68   |  1  |  0  |  0  |
+| 68+  |  1  |  0  |  0  |
+| 69   |  1  |  0  |  0  |
+| 69+  |  1  |  0  |  0  |
+| 70   |  1  |  0  |  0  |
+| 70+  |  1  |  0  |  0  |
+| 71   |  1  |  0  |  0  |
+| 71+  |  1  |  0  |  0  |
+| 72   |  1  |  0  |  0  |
+| 72+  |  1  |  0  |  0  |
+| 73   |  1  |  0  |  0  |
+| 73+  |  1  |  0  |  0  |
+| 74   |  1  |  0  |  0  |
+| 74+  |  1  |  0  |  0  |
+| 75   |  1  |  0  |  0  |
+| 75+  |  1  |  0  |  0  |
+| 76   |  1  |  0  |  0  |
+| 76+  |  1  |  0  |  0  |
+| 77   |  1  |  0  |  0  |
+| 77+  |  1  |  0  |  0  |
+| 78   |  1  |  0  |  0  |
+| 78+  |  1  |  0  |  0  |
+| 79   |  1  |  0  |  0  |
+| 79+  |  1  |  0  |  0  |
+| 80   |  1  |  0  |  0  |
+| 80+  |  1  |  0  |  0  |
+| 81   |  1  |  0  |  0  |
+| 81+  |  1  |  0  |  0  |
+| 82   |  1  |  0  |  0  |
+| 82+  |  1  |  0  |  0  |
+| 83   |  1  |  0  |  0  |
+| 83+  |  1  |  0  |  0  |
+| 84   |  1  |  0  |  0  |
+| 84+  |  1  |  0  |  0  |
+| 85   |  1  |  0  |  0  |
+| 85+  |  1  |  0  |  0  |
+| 86   |  1  |  0  |  0  |
+| 86+  |  1  |  0  |  0  |
+| 87   |  1  |  0  |  0  |
+| 87+  |  1  |  0  |  0  |
+| 88   |  1  |  0  |  0  |
+| 88+  |  1  |  0  |  0  |
+| 89   |  1  |  0  |  0  |
+| 89+  |  1  |  0  |  0  |
+| 90   |  1  |  0  |  0  |
+| 90+  |  1  |  0  |  0  |
+| 91   |  1  |  0  |  0  |
+| 91+  |  1  |  0  |  0  |
+| 92   |  1  |  0  |  0  |
+| 92+  |  1  |  0  |  0  |
+| 93   |  1  |  0  |  0  |
+| 93+  |  1  |  0  |  0  |
+| 94   |  1  |  0  |  0  |
+| 94+  |  1  |  0  |  0  |
+| 95   |  1  |  0  |  0  |
+| 95+  |  1  |  0  |  0  |
+| 96   |  1  |  0  |  0  |
+| 96+  |  1  |  0  |  0  |
+| 97   |  1  |  0  |  0  |
+| 97+  |  1  |  0  |  0  |
+| 98   |  1  |  0  |  0  |
+| 98+  |  1  |  0  |  0  |
+| 99   |  1  |  0  |  0  |
+| 99+  |  1  |  0  |  0  |
+| 100  |  1  |  0  |  0  |
+| 100+ |  1  |  0  |  0  |
+| 101  |  1  |  0  |  0  |
+| 101+ |  1  |  0  |  0  |
+| 102  |  1  |  0  |  0  |
+| 102+ |  1  |  0  |  0  |
+| 103  |  1  |  0  |  0  |
+| 103+ |  1  |  0  |  0  |
+| 104  |  1  |  0  |  0  |
+| 104+ |  1  |  0  |  0  |
+| 105  |  1  |  0  |  0  |
+| 105+ |  1  |  0  |  0  |
+| 106  |  1  |  0  |  0  |
+| 106+ |  1  |  0  |  0  |
+| 107  |  1  |  0  |  0  |
diff --git a/projects/03/a/Bit.hdl b/projects/03/a/Bit.hdl
new file mode 100644
index 0000000..3064198
--- /dev/null
+++ b/projects/03/a/Bit.hdl
@@ -0,0 +1,18 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/Bit.hdl
+
+/**
+ * 1-bit register:
+ * If load[t] == 1 then out[t+1] = in[t]
+ *                 else out does not change (out[t+1] = out[t])
+ */
+
+CHIP Bit {
+    IN in, load;
+    OUT out;
+
+    PARTS:
+    // Put your code here:
+}
diff --git a/projects/03/a/Bit.tst b/projects/03/a/Bit.tst
new file mode 100644
index 0000000..c6bf523
--- /dev/null
+++ b/projects/03/a/Bit.tst
@@ -0,0 +1,865 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/Bit.tst
+
+load Bit.hdl,
+output-file Bit.out,
+compare-to Bit.cmp,
+output-list time%S1.4.1 in%B2.1.2 load%B2.1.2 out%B2.1.2;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 1,
+set load 0,
+tick,
+output;
+
+tock,
+output;
diff --git a/projects/03/a/PC.cmp b/projects/03/a/PC.cmp
new file mode 100644
index 0000000..6a050d9
--- /dev/null
+++ b/projects/03/a/PC.cmp
@@ -0,0 +1,31 @@
+| time |   in   |reset|load | inc |  out   |
+| 0+   |      0 |  0  |  0  |  0  |      0 |
+| 1    |      0 |  0  |  0  |  0  |      0 |
+| 1+   |      0 |  0  |  0  |  1  |      0 |
+| 2    |      0 |  0  |  0  |  1  |      1 |
+| 2+   | -32123 |  0  |  0  |  1  |      1 |
+| 3    | -32123 |  0  |  0  |  1  |      2 |
+| 3+   | -32123 |  0  |  1  |  1  |      2 |
+| 4    | -32123 |  0  |  1  |  1  | -32123 |
+| 4+   | -32123 |  0  |  0  |  1  | -32123 |
+| 5    | -32123 |  0  |  0  |  1  | -32122 |
+| 5+   | -32123 |  0  |  0  |  1  | -32122 |
+| 6    | -32123 |  0  |  0  |  1  | -32121 |
+| 6+   |  12345 |  0  |  1  |  0  | -32121 |
+| 7    |  12345 |  0  |  1  |  0  |  12345 |
+| 7+   |  12345 |  1  |  1  |  0  |  12345 |
+| 8    |  12345 |  1  |  1  |  0  |      0 |
+| 8+   |  12345 |  0  |  1  |  1  |      0 |
+| 9    |  12345 |  0  |  1  |  1  |  12345 |
+| 9+   |  12345 |  1  |  1  |  1  |  12345 |
+| 10   |  12345 |  1  |  1  |  1  |      0 |
+| 10+  |  12345 |  0  |  0  |  1  |      0 |
+| 11   |  12345 |  0  |  0  |  1  |      1 |
+| 11+  |  12345 |  1  |  0  |  1  |      1 |
+| 12   |  12345 |  1  |  0  |  1  |      0 |
+| 12+  |      0 |  0  |  1  |  1  |      0 |
+| 13   |      0 |  0  |  1  |  1  |      0 |
+| 13+  |      0 |  0  |  0  |  1  |      0 |
+| 14   |      0 |  0  |  0  |  1  |      1 |
+| 14+  |  22222 |  1  |  0  |  0  |      1 |
+| 15   |  22222 |  1  |  0  |  0  |      0 |
diff --git a/projects/03/a/PC.hdl b/projects/03/a/PC.hdl
new file mode 100644
index 0000000..a326e43
--- /dev/null
+++ b/projects/03/a/PC.hdl
@@ -0,0 +1,20 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/PC.hdl
+
+/**
+ * A 16-bit counter with load and reset control bits.
+ * if      (reset[t] == 1) out[t+1] = 0
+ * else if (load[t] == 1)  out[t+1] = in[t]
+ * else if (inc[t] == 1)   out[t+1] = out[t] + 1  (integer addition)
+ * else                    out[t+1] = out[t]
+ */
+
+CHIP PC {
+    IN in[16],load,inc,reset;
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+}
diff --git a/projects/03/a/PC.tst b/projects/03/a/PC.tst
new file mode 100644
index 0000000..7f4f3cd
--- /dev/null
+++ b/projects/03/a/PC.tst
@@ -0,0 +1,125 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/PC.tst
+
+load PC.hdl,
+output-file PC.out,
+compare-to PC.cmp,
+output-list time%S1.4.1 in%D1.6.1 reset%B2.1.2 load%B2.1.2 inc%B2.1.2 out%D1.6.1;
+
+set in 0,
+set reset 0,
+set load 0,
+set inc 0,
+tick,
+output;
+
+tock,
+output;
+
+set inc 1,
+tick,
+output;
+
+tock,
+output;
+
+set in -32123,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+tick,
+output;
+
+tock,
+output;
+
+set in 12345,
+set load 1,
+set inc 0,
+tick,
+output;
+
+tock,
+output;
+
+set reset 1,
+tick,
+output;
+
+tock,
+output;
+
+set reset 0,
+set inc 1,
+tick,
+output;
+
+tock,
+output;
+
+set reset 1,
+tick,
+output;
+
+tock,
+output;
+
+set reset 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set reset 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set reset 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set load 0,
+set inc 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 22222,
+set reset 1,
+set inc 0,
+tick,
+output;
+
+tock,
+output;
diff --git a/projects/03/a/RAM64.cmp b/projects/03/a/RAM64.cmp
new file mode 100644
index 0000000..fdb7745
--- /dev/null
+++ b/projects/03/a/RAM64.cmp
@@ -0,0 +1,320 @@
+| time |   in   |load |address|  out   |
+| 0+   |      0 |  0  |    0  |      0 |
+| 1    |      0 |  0  |    0  |      0 |
+| 1+   |      0 |  1  |    0  |      0 |
+| 2    |      0 |  1  |    0  |      0 |
+| 2+   |   1313 |  0  |    0  |      0 |
+| 3    |   1313 |  0  |    0  |      0 |
+| 3+   |   1313 |  1  |   13  |      0 |
+| 4    |   1313 |  1  |   13  |   1313 |
+| 4+   |   1313 |  0  |    0  |      0 |
+| 5    |   1313 |  0  |    0  |      0 |
+| 5+   |   4747 |  0  |   47  |      0 |
+| 6    |   4747 |  0  |   47  |      0 |
+| 6+   |   4747 |  1  |   47  |      0 |
+| 7    |   4747 |  1  |   47  |   4747 |
+| 7+   |   4747 |  0  |   47  |   4747 |
+| 8    |   4747 |  0  |   47  |   4747 |
+| 8    |   4747 |  0  |   13  |   1313 |
+| 8+   |   6363 |  0  |   13  |   1313 |
+| 9    |   6363 |  0  |   13  |   1313 |
+| 9+   |   6363 |  1  |   63  |      0 |
+| 10   |   6363 |  1  |   63  |   6363 |
+| 10+  |   6363 |  0  |   63  |   6363 |
+| 11   |   6363 |  0  |   63  |   6363 |
+| 11   |   6363 |  0  |   47  |   4747 |
+| 11   |   6363 |  0  |   63  |   6363 |
+| 11+  |   6363 |  0  |   40  |      0 |
+| 12   |   6363 |  0  |   40  |      0 |
+| 12   |   6363 |  0  |   41  |      0 |
+| 12   |   6363 |  0  |   42  |      0 |
+| 12   |   6363 |  0  |   43  |      0 |
+| 12   |   6363 |  0  |   44  |      0 |
+| 12   |   6363 |  0  |   45  |      0 |
+| 12   |   6363 |  0  |   46  |      0 |
+| 12   |   6363 |  0  |   47  |   4747 |
+| 12+  |  21845 |  1  |   40  |      0 |
+| 13   |  21845 |  1  |   40  |  21845 |
+| 13+  |  21845 |  1  |   41  |      0 |
+| 14   |  21845 |  1  |   41  |  21845 |
+| 14+  |  21845 |  1  |   42  |      0 |
+| 15   |  21845 |  1  |   42  |  21845 |
+| 15+  |  21845 |  1  |   43  |      0 |
+| 16   |  21845 |  1  |   43  |  21845 |
+| 16+  |  21845 |  1  |   44  |      0 |
+| 17   |  21845 |  1  |   44  |  21845 |
+| 17+  |  21845 |  1  |   45  |      0 |
+| 18   |  21845 |  1  |   45  |  21845 |
+| 18+  |  21845 |  1  |   46  |      0 |
+| 19   |  21845 |  1  |   46  |  21845 |
+| 19+  |  21845 |  1  |   47  |   4747 |
+| 20   |  21845 |  1  |   47  |  21845 |
+| 20+  |  21845 |  0  |   40  |  21845 |
+| 21   |  21845 |  0  |   40  |  21845 |
+| 21   |  21845 |  0  |   41  |  21845 |
+| 21   |  21845 |  0  |   42  |  21845 |
+| 21   |  21845 |  0  |   43  |  21845 |
+| 21   |  21845 |  0  |   44  |  21845 |
+| 21   |  21845 |  0  |   45  |  21845 |
+| 21   |  21845 |  0  |   46  |  21845 |
+| 21   |  21845 |  0  |   47  |  21845 |
+| 21+  | -21846 |  1  |   40  |  21845 |
+| 22   | -21846 |  1  |   40  | -21846 |
+| 22+  | -21846 |  0  |   40  | -21846 |
+| 23   | -21846 |  0  |   40  | -21846 |
+| 23   | -21846 |  0  |   41  |  21845 |
+| 23   | -21846 |  0  |   42  |  21845 |
+| 23   | -21846 |  0  |   43  |  21845 |
+| 23   | -21846 |  0  |   44  |  21845 |
+| 23   | -21846 |  0  |   45  |  21845 |
+| 23   | -21846 |  0  |   46  |  21845 |
+| 23   | -21846 |  0  |   47  |  21845 |
+| 23+  |  21845 |  1  |   40  | -21846 |
+| 24   |  21845 |  1  |   40  |  21845 |
+| 24+  | -21846 |  1  |   41  |  21845 |
+| 25   | -21846 |  1  |   41  | -21846 |
+| 25+  | -21846 |  0  |   40  |  21845 |
+| 26   | -21846 |  0  |   40  |  21845 |
+| 26   | -21846 |  0  |   41  | -21846 |
+| 26   | -21846 |  0  |   42  |  21845 |
+| 26   | -21846 |  0  |   43  |  21845 |
+| 26   | -21846 |  0  |   44  |  21845 |
+| 26   | -21846 |  0  |   45  |  21845 |
+| 26   | -21846 |  0  |   46  |  21845 |
+| 26   | -21846 |  0  |   47  |  21845 |
+| 26+  |  21845 |  1  |   41  | -21846 |
+| 27   |  21845 |  1  |   41  |  21845 |
+| 27+  | -21846 |  1  |   42  |  21845 |
+| 28   | -21846 |  1  |   42  | -21846 |
+| 28+  | -21846 |  0  |   40  |  21845 |
+| 29   | -21846 |  0  |   40  |  21845 |
+| 29   | -21846 |  0  |   41  |  21845 |
+| 29   | -21846 |  0  |   42  | -21846 |
+| 29   | -21846 |  0  |   43  |  21845 |
+| 29   | -21846 |  0  |   44  |  21845 |
+| 29   | -21846 |  0  |   45  |  21845 |
+| 29   | -21846 |  0  |   46  |  21845 |
+| 29   | -21846 |  0  |   47  |  21845 |
+| 29+  |  21845 |  1  |   42  | -21846 |
+| 30   |  21845 |  1  |   42  |  21845 |
+| 30+  | -21846 |  1  |   43  |  21845 |
+| 31   | -21846 |  1  |   43  | -21846 |
+| 31+  | -21846 |  0  |   40  |  21845 |
+| 32   | -21846 |  0  |   40  |  21845 |
+| 32   | -21846 |  0  |   41  |  21845 |
+| 32   | -21846 |  0  |   42  |  21845 |
+| 32   | -21846 |  0  |   43  | -21846 |
+| 32   | -21846 |  0  |   44  |  21845 |
+| 32   | -21846 |  0  |   45  |  21845 |
+| 32   | -21846 |  0  |   46  |  21845 |
+| 32   | -21846 |  0  |   47  |  21845 |
+| 32+  |  21845 |  1  |   43  | -21846 |
+| 33   |  21845 |  1  |   43  |  21845 |
+| 33+  | -21846 |  1  |   44  |  21845 |
+| 34   | -21846 |  1  |   44  | -21846 |
+| 34+  | -21846 |  0  |   40  |  21845 |
+| 35   | -21846 |  0  |   40  |  21845 |
+| 35   | -21846 |  0  |   41  |  21845 |
+| 35   | -21846 |  0  |   42  |  21845 |
+| 35   | -21846 |  0  |   43  |  21845 |
+| 35   | -21846 |  0  |   44  | -21846 |
+| 35   | -21846 |  0  |   45  |  21845 |
+| 35   | -21846 |  0  |   46  |  21845 |
+| 35   | -21846 |  0  |   47  |  21845 |
+| 35+  |  21845 |  1  |   44  | -21846 |
+| 36   |  21845 |  1  |   44  |  21845 |
+| 36+  | -21846 |  1  |   45  |  21845 |
+| 37   | -21846 |  1  |   45  | -21846 |
+| 37+  | -21846 |  0  |   40  |  21845 |
+| 38   | -21846 |  0  |   40  |  21845 |
+| 38   | -21846 |  0  |   41  |  21845 |
+| 38   | -21846 |  0  |   42  |  21845 |
+| 38   | -21846 |  0  |   43  |  21845 |
+| 38   | -21846 |  0  |   44  |  21845 |
+| 38   | -21846 |  0  |   45  | -21846 |
+| 38   | -21846 |  0  |   46  |  21845 |
+| 38   | -21846 |  0  |   47  |  21845 |
+| 38+  |  21845 |  1  |   45  | -21846 |
+| 39   |  21845 |  1  |   45  |  21845 |
+| 39+  | -21846 |  1  |   46  |  21845 |
+| 40   | -21846 |  1  |   46  | -21846 |
+| 40+  | -21846 |  0  |   40  |  21845 |
+| 41   | -21846 |  0  |   40  |  21845 |
+| 41   | -21846 |  0  |   41  |  21845 |
+| 41   | -21846 |  0  |   42  |  21845 |
+| 41   | -21846 |  0  |   43  |  21845 |
+| 41   | -21846 |  0  |   44  |  21845 |
+| 41   | -21846 |  0  |   45  |  21845 |
+| 41   | -21846 |  0  |   46  | -21846 |
+| 41   | -21846 |  0  |   47  |  21845 |
+| 41+  |  21845 |  1  |   46  | -21846 |
+| 42   |  21845 |  1  |   46  |  21845 |
+| 42+  | -21846 |  1  |   47  |  21845 |
+| 43   | -21846 |  1  |   47  | -21846 |
+| 43+  | -21846 |  0  |   40  |  21845 |
+| 44   | -21846 |  0  |   40  |  21845 |
+| 44   | -21846 |  0  |   41  |  21845 |
+| 44   | -21846 |  0  |   42  |  21845 |
+| 44   | -21846 |  0  |   43  |  21845 |
+| 44   | -21846 |  0  |   44  |  21845 |
+| 44   | -21846 |  0  |   45  |  21845 |
+| 44   | -21846 |  0  |   46  |  21845 |
+| 44   | -21846 |  0  |   47  | -21846 |
+| 44+  |  21845 |  1  |   47  | -21846 |
+| 45   |  21845 |  1  |   47  |  21845 |
+| 45+  |  21845 |  0  |   40  |  21845 |
+| 46   |  21845 |  0  |   40  |  21845 |
+| 46   |  21845 |  0  |   41  |  21845 |
+| 46   |  21845 |  0  |   42  |  21845 |
+| 46   |  21845 |  0  |   43  |  21845 |
+| 46   |  21845 |  0  |   44  |  21845 |
+| 46   |  21845 |  0  |   45  |  21845 |
+| 46   |  21845 |  0  |   46  |  21845 |
+| 46   |  21845 |  0  |   47  |  21845 |
+| 46+  |  21845 |  0  |    5  |      0 |
+| 47   |  21845 |  0  |    5  |      0 |
+| 47   |  21845 |  0  |   13  |   1313 |
+| 47   |  21845 |  0  |   21  |      0 |
+| 47   |  21845 |  0  |   29  |      0 |
+| 47   |  21845 |  0  |   37  |      0 |
+| 47   |  21845 |  0  |   45  |  21845 |
+| 47   |  21845 |  0  |   53  |      0 |
+| 47   |  21845 |  0  |   61  |      0 |
+| 47+  |  21845 |  1  |    5  |      0 |
+| 48   |  21845 |  1  |    5  |  21845 |
+| 48+  |  21845 |  1  |   13  |   1313 |
+| 49   |  21845 |  1  |   13  |  21845 |
+| 49+  |  21845 |  1  |   21  |      0 |
+| 50   |  21845 |  1  |   21  |  21845 |
+| 50+  |  21845 |  1  |   29  |      0 |
+| 51   |  21845 |  1  |   29  |  21845 |
+| 51+  |  21845 |  1  |   37  |      0 |
+| 52   |  21845 |  1  |   37  |  21845 |
+| 52+  |  21845 |  1  |   45  |  21845 |
+| 53   |  21845 |  1  |   45  |  21845 |
+| 53+  |  21845 |  1  |   53  |      0 |
+| 54   |  21845 |  1  |   53  |  21845 |
+| 54+  |  21845 |  1  |   61  |      0 |
+| 55   |  21845 |  1  |   61  |  21845 |
+| 55+  |  21845 |  0  |    5  |  21845 |
+| 56   |  21845 |  0  |    5  |  21845 |
+| 56   |  21845 |  0  |   13  |  21845 |
+| 56   |  21845 |  0  |   21  |  21845 |
+| 56   |  21845 |  0  |   29  |  21845 |
+| 56   |  21845 |  0  |   37  |  21845 |
+| 56   |  21845 |  0  |   45  |  21845 |
+| 56   |  21845 |  0  |   53  |  21845 |
+| 56   |  21845 |  0  |   61  |  21845 |
+| 56+  | -21846 |  1  |    5  |  21845 |
+| 57   | -21846 |  1  |    5  | -21846 |
+| 57+  | -21846 |  0  |    5  | -21846 |
+| 58   | -21846 |  0  |    5  | -21846 |
+| 58   | -21846 |  0  |   13  |  21845 |
+| 58   | -21846 |  0  |   21  |  21845 |
+| 58   | -21846 |  0  |   29  |  21845 |
+| 58   | -21846 |  0  |   37  |  21845 |
+| 58   | -21846 |  0  |   45  |  21845 |
+| 58   | -21846 |  0  |   53  |  21845 |
+| 58   | -21846 |  0  |   61  |  21845 |
+| 58+  |  21845 |  1  |    5  | -21846 |
+| 59   |  21845 |  1  |    5  |  21845 |
+| 59+  | -21846 |  1  |   13  |  21845 |
+| 60   | -21846 |  1  |   13  | -21846 |
+| 60+  | -21846 |  0  |    5  |  21845 |
+| 61   | -21846 |  0  |    5  |  21845 |
+| 61   | -21846 |  0  |   13  | -21846 |
+| 61   | -21846 |  0  |   21  |  21845 |
+| 61   | -21846 |  0  |   29  |  21845 |
+| 61   | -21846 |  0  |   37  |  21845 |
+| 61   | -21846 |  0  |   45  |  21845 |
+| 61   | -21846 |  0  |   53  |  21845 |
+| 61   | -21846 |  0  |   61  |  21845 |
+| 61+  |  21845 |  1  |   13  | -21846 |
+| 62   |  21845 |  1  |   13  |  21845 |
+| 62+  | -21846 |  1  |   21  |  21845 |
+| 63   | -21846 |  1  |   21  | -21846 |
+| 63+  | -21846 |  0  |    5  |  21845 |
+| 64   | -21846 |  0  |    5  |  21845 |
+| 64   | -21846 |  0  |   13  |  21845 |
+| 64   | -21846 |  0  |   21  | -21846 |
+| 64   | -21846 |  0  |   29  |  21845 |
+| 64   | -21846 |  0  |   37  |  21845 |
+| 64   | -21846 |  0  |   45  |  21845 |
+| 64   | -21846 |  0  |   53  |  21845 |
+| 64   | -21846 |  0  |   61  |  21845 |
+| 64+  |  21845 |  1  |   21  | -21846 |
+| 65   |  21845 |  1  |   21  |  21845 |
+| 65+  | -21846 |  1  |   29  |  21845 |
+| 66   | -21846 |  1  |   29  | -21846 |
+| 66+  | -21846 |  0  |    5  |  21845 |
+| 67   | -21846 |  0  |    5  |  21845 |
+| 67   | -21846 |  0  |   13  |  21845 |
+| 67   | -21846 |  0  |   21  |  21845 |
+| 67   | -21846 |  0  |   29  | -21846 |
+| 67   | -21846 |  0  |   37  |  21845 |
+| 67   | -21846 |  0  |   45  |  21845 |
+| 67   | -21846 |  0  |   53  |  21845 |
+| 67   | -21846 |  0  |   61  |  21845 |
+| 67+  |  21845 |  1  |   29  | -21846 |
+| 68   |  21845 |  1  |   29  |  21845 |
+| 68+  | -21846 |  1  |   37  |  21845 |
+| 69   | -21846 |  1  |   37  | -21846 |
+| 69+  | -21846 |  0  |    5  |  21845 |
+| 70   | -21846 |  0  |    5  |  21845 |
+| 70   | -21846 |  0  |   13  |  21845 |
+| 70   | -21846 |  0  |   21  |  21845 |
+| 70   | -21846 |  0  |   29  |  21845 |
+| 70   | -21846 |  0  |   37  | -21846 |
+| 70   | -21846 |  0  |   45  |  21845 |
+| 70   | -21846 |  0  |   53  |  21845 |
+| 70   | -21846 |  0  |   61  |  21845 |
+| 70+  |  21845 |  1  |   37  | -21846 |
+| 71   |  21845 |  1  |   37  |  21845 |
+| 71+  | -21846 |  1  |   45  |  21845 |
+| 72   | -21846 |  1  |   45  | -21846 |
+| 72+  | -21846 |  0  |    5  |  21845 |
+| 73   | -21846 |  0  |    5  |  21845 |
+| 73   | -21846 |  0  |   13  |  21845 |
+| 73   | -21846 |  0  |   21  |  21845 |
+| 73   | -21846 |  0  |   29  |  21845 |
+| 73   | -21846 |  0  |   37  |  21845 |
+| 73   | -21846 |  0  |   45  | -21846 |
+| 73   | -21846 |  0  |   53  |  21845 |
+| 73   | -21846 |  0  |   61  |  21845 |
+| 73+  |  21845 |  1  |   45  | -21846 |
+| 74   |  21845 |  1  |   45  |  21845 |
+| 74+  | -21846 |  1  |   53  |  21845 |
+| 75   | -21846 |  1  |   53  | -21846 |
+| 75+  | -21846 |  0  |    5  |  21845 |
+| 76   | -21846 |  0  |    5  |  21845 |
+| 76   | -21846 |  0  |   13  |  21845 |
+| 76   | -21846 |  0  |   21  |  21845 |
+| 76   | -21846 |  0  |   29  |  21845 |
+| 76   | -21846 |  0  |   37  |  21845 |
+| 76   | -21846 |  0  |   45  |  21845 |
+| 76   | -21846 |  0  |   53  | -21846 |
+| 76   | -21846 |  0  |   61  |  21845 |
+| 76+  |  21845 |  1  |   53  | -21846 |
+| 77   |  21845 |  1  |   53  |  21845 |
+| 77+  | -21846 |  1  |   61  |  21845 |
+| 78   | -21846 |  1  |   61  | -21846 |
+| 78+  | -21846 |  0  |    5  |  21845 |
+| 79   | -21846 |  0  |    5  |  21845 |
+| 79   | -21846 |  0  |   13  |  21845 |
+| 79   | -21846 |  0  |   21  |  21845 |
+| 79   | -21846 |  0  |   29  |  21845 |
+| 79   | -21846 |  0  |   37  |  21845 |
+| 79   | -21846 |  0  |   45  |  21845 |
+| 79   | -21846 |  0  |   53  |  21845 |
+| 79   | -21846 |  0  |   61  | -21846 |
+| 79+  |  21845 |  1  |   61  | -21846 |
+| 80   |  21845 |  1  |   61  |  21845 |
+| 80+  |  21845 |  0  |    5  |  21845 |
+| 81   |  21845 |  0  |    5  |  21845 |
+| 81   |  21845 |  0  |   13  |  21845 |
+| 81   |  21845 |  0  |   21  |  21845 |
+| 81   |  21845 |  0  |   29  |  21845 |
+| 81   |  21845 |  0  |   37  |  21845 |
+| 81   |  21845 |  0  |   45  |  21845 |
+| 81   |  21845 |  0  |   53  |  21845 |
+| 81   |  21845 |  0  |   61  |  21845 |
diff --git a/projects/03/a/RAM64.hdl b/projects/03/a/RAM64.hdl
new file mode 100644
index 0000000..66efcbd
--- /dev/null
+++ b/projects/03/a/RAM64.hdl
@@ -0,0 +1,19 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/RAM64.hdl
+
+/**
+ * Memory of 64 registers, each 16 bit-wide. Out holds the value
+ * stored at the memory location specified by address. If load==1, then 
+ * the in value is loaded into the memory location specified by address 
+ * (the loaded value will be emitted to out from the next time step onward).
+ */
+
+CHIP RAM64 {
+    IN in[16], load, address[6];
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+}
+\ No newline at end of file
diff --git a/projects/03/a/RAM64.tst b/projects/03/a/RAM64.tst
new file mode 100644
index 0000000..e1a1409
--- /dev/null
+++ b/projects/03/a/RAM64.tst
@@ -0,0 +1,1026 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/RAM64.tst
+
+load RAM64.hdl,
+output-file RAM64.out,
+compare-to RAM64.cmp,
+output-list time%S1.4.1 in%D1.6.1 load%B2.1.2 address%D2.3.2 out%D1.6.1;
+
+set in 0,
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+tick,
+output;
+tock,
+output;
+
+set in 1313,
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+set address 13,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+
+set in 4747,
+set address 47,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set address 13,
+eval,
+output;
+
+set in 6363,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+set address 63,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set address 47,
+eval,
+output;
+
+set address 63,
+eval,
+output;
+
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set in %B0101010101010101,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+tick,
+output,
+tock,
+output;
+set address %B101010,
+tick,
+output,
+tock,
+output;
+set address %B101011,
+tick,
+output,
+tock,
+output;
+set address %B101100,
+tick,
+output,
+tock,
+output;
+set address %B101101,
+tick,
+output,
+tock,
+output;
+set address %B101110,
+tick,
+output,
+tock,
+output;
+set address %B101111,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101000,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101000,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101001,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101001,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101010,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101010,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101011,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101011,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101100,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101100,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101110,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101110,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101111,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+set load 1,
+set address %B101111,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address %B101000,
+tick,
+output;
+tock,
+output;
+set address %B101001,
+eval,
+output;
+set address %B101010,
+eval,
+output;
+set address %B101011,
+eval,
+output;
+set address %B101100,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B101110,
+eval,
+output;
+set address %B101111,
+eval,
+output;
+
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set in %B0101010101010101,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+tick,
+output,
+tock,
+output;
+set address %B010101,
+tick,
+output,
+tock,
+output;
+set address %B011101,
+tick,
+output,
+tock,
+output;
+set address %B100101,
+tick,
+output,
+tock,
+output;
+set address %B101101,
+tick,
+output,
+tock,
+output;
+set address %B110101,
+tick,
+output,
+tock,
+output;
+set address %B111101,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B000101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B000101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B001101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B001101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B010101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B010101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B011101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B011101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B100101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B100101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B101101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B101101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B110101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B110101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address %B111101,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
+
+set load 1,
+set address %B111101,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address %B000101,
+tick,
+output;
+tock,
+output;
+set address %B001101,
+eval,
+output;
+set address %B010101,
+eval,
+output;
+set address %B011101,
+eval,
+output;
+set address %B100101,
+eval,
+output;
+set address %B101101,
+eval,
+output;
+set address %B110101,
+eval,
+output;
+set address %B111101,
+eval,
+output;
diff --git a/projects/03/a/RAM8.cmp b/projects/03/a/RAM8.cmp
new file mode 100644
index 0000000..536c6ef
--- /dev/null
+++ b/projects/03/a/RAM8.cmp
@@ -0,0 +1,173 @@
+| time |   in   |load |address|  out   |
+| 0+   |      0 |  0  |   0   |      0 |
+| 1    |      0 |  0  |   0   |      0 |
+| 1+   |      0 |  1  |   0   |      0 |
+| 2    |      0 |  1  |   0   |      0 |
+| 2+   |  11111 |  0  |   0   |      0 |
+| 3    |  11111 |  0  |   0   |      0 |
+| 3+   |  11111 |  1  |   1   |      0 |
+| 4    |  11111 |  1  |   1   |  11111 |
+| 4+   |  11111 |  0  |   0   |      0 |
+| 5    |  11111 |  0  |   0   |      0 |
+| 5+   |   3333 |  0  |   3   |      0 |
+| 6    |   3333 |  0  |   3   |      0 |
+| 6+   |   3333 |  1  |   3   |      0 |
+| 7    |   3333 |  1  |   3   |   3333 |
+| 7+   |   3333 |  0  |   3   |   3333 |
+| 8    |   3333 |  0  |   3   |   3333 |
+| 8    |   3333 |  0  |   1   |  11111 |
+| 8+   |   7777 |  0  |   1   |  11111 |
+| 9    |   7777 |  0  |   1   |  11111 |
+| 9+   |   7777 |  1  |   7   |      0 |
+| 10   |   7777 |  1  |   7   |   7777 |
+| 10+  |   7777 |  0  |   7   |   7777 |
+| 11   |   7777 |  0  |   7   |   7777 |
+| 11   |   7777 |  0  |   3   |   3333 |
+| 11   |   7777 |  0  |   7   |   7777 |
+| 11+  |   7777 |  0  |   0   |      0 |
+| 12   |   7777 |  0  |   0   |      0 |
+| 12   |   7777 |  0  |   1   |  11111 |
+| 12   |   7777 |  0  |   2   |      0 |
+| 12   |   7777 |  0  |   3   |   3333 |
+| 12   |   7777 |  0  |   4   |      0 |
+| 12   |   7777 |  0  |   5   |      0 |
+| 12   |   7777 |  0  |   6   |      0 |
+| 12   |   7777 |  0  |   7   |   7777 |
+| 12+  |  21845 |  1  |   0   |      0 |
+| 13   |  21845 |  1  |   0   |  21845 |
+| 13+  |  21845 |  1  |   1   |  11111 |
+| 14   |  21845 |  1  |   1   |  21845 |
+| 14+  |  21845 |  1  |   2   |      0 |
+| 15   |  21845 |  1  |   2   |  21845 |
+| 15+  |  21845 |  1  |   3   |   3333 |
+| 16   |  21845 |  1  |   3   |  21845 |
+| 16+  |  21845 |  1  |   4   |      0 |
+| 17   |  21845 |  1  |   4   |  21845 |
+| 17+  |  21845 |  1  |   5   |      0 |
+| 18   |  21845 |  1  |   5   |  21845 |
+| 18+  |  21845 |  1  |   6   |      0 |
+| 19   |  21845 |  1  |   6   |  21845 |
+| 19+  |  21845 |  1  |   7   |   7777 |
+| 20   |  21845 |  1  |   7   |  21845 |
+| 20+  |  21845 |  0  |   0   |  21845 |
+| 21   |  21845 |  0  |   0   |  21845 |
+| 21   |  21845 |  0  |   1   |  21845 |
+| 21   |  21845 |  0  |   2   |  21845 |
+| 21   |  21845 |  0  |   3   |  21845 |
+| 21   |  21845 |  0  |   4   |  21845 |
+| 21   |  21845 |  0  |   5   |  21845 |
+| 21   |  21845 |  0  |   6   |  21845 |
+| 21   |  21845 |  0  |   7   |  21845 |
+| 21+  | -21846 |  1  |   0   |  21845 |
+| 22   | -21846 |  1  |   0   | -21846 |
+| 22+  | -21846 |  0  |   0   | -21846 |
+| 23   | -21846 |  0  |   0   | -21846 |
+| 23   | -21846 |  0  |   1   |  21845 |
+| 23   | -21846 |  0  |   2   |  21845 |
+| 23   | -21846 |  0  |   3   |  21845 |
+| 23   | -21846 |  0  |   4   |  21845 |
+| 23   | -21846 |  0  |   5   |  21845 |
+| 23   | -21846 |  0  |   6   |  21845 |
+| 23   | -21846 |  0  |   7   |  21845 |
+| 23+  |  21845 |  1  |   0   | -21846 |
+| 24   |  21845 |  1  |   0   |  21845 |
+| 24+  | -21846 |  1  |   1   |  21845 |
+| 25   | -21846 |  1  |   1   | -21846 |
+| 25+  | -21846 |  0  |   0   |  21845 |
+| 26   | -21846 |  0  |   0   |  21845 |
+| 26   | -21846 |  0  |   1   | -21846 |
+| 26   | -21846 |  0  |   2   |  21845 |
+| 26   | -21846 |  0  |   3   |  21845 |
+| 26   | -21846 |  0  |   4   |  21845 |
+| 26   | -21846 |  0  |   5   |  21845 |
+| 26   | -21846 |  0  |   6   |  21845 |
+| 26   | -21846 |  0  |   7   |  21845 |
+| 26+  |  21845 |  1  |   1   | -21846 |
+| 27   |  21845 |  1  |   1   |  21845 |
+| 27+  | -21846 |  1  |   2   |  21845 |
+| 28   | -21846 |  1  |   2   | -21846 |
+| 28+  | -21846 |  0  |   0   |  21845 |
+| 29   | -21846 |  0  |   0   |  21845 |
+| 29   | -21846 |  0  |   1   |  21845 |
+| 29   | -21846 |  0  |   2   | -21846 |
+| 29   | -21846 |  0  |   3   |  21845 |
+| 29   | -21846 |  0  |   4   |  21845 |
+| 29   | -21846 |  0  |   5   |  21845 |
+| 29   | -21846 |  0  |   6   |  21845 |
+| 29   | -21846 |  0  |   7   |  21845 |
+| 29+  |  21845 |  1  |   2   | -21846 |
+| 30   |  21845 |  1  |   2   |  21845 |
+| 30+  | -21846 |  1  |   3   |  21845 |
+| 31   | -21846 |  1  |   3   | -21846 |
+| 31+  | -21846 |  0  |   0   |  21845 |
+| 32   | -21846 |  0  |   0   |  21845 |
+| 32   | -21846 |  0  |   1   |  21845 |
+| 32   | -21846 |  0  |   2   |  21845 |
+| 32   | -21846 |  0  |   3   | -21846 |
+| 32   | -21846 |  0  |   4   |  21845 |
+| 32   | -21846 |  0  |   5   |  21845 |
+| 32   | -21846 |  0  |   6   |  21845 |
+| 32   | -21846 |  0  |   7   |  21845 |
+| 32+  |  21845 |  1  |   3   | -21846 |
+| 33   |  21845 |  1  |   3   |  21845 |
+| 33+  | -21846 |  1  |   4   |  21845 |
+| 34   | -21846 |  1  |   4   | -21846 |
+| 34+  | -21846 |  0  |   0   |  21845 |
+| 35   | -21846 |  0  |   0   |  21845 |
+| 35   | -21846 |  0  |   1   |  21845 |
+| 35   | -21846 |  0  |   2   |  21845 |
+| 35   | -21846 |  0  |   3   |  21845 |
+| 35   | -21846 |  0  |   4   | -21846 |
+| 35   | -21846 |  0  |   5   |  21845 |
+| 35   | -21846 |  0  |   6   |  21845 |
+| 35   | -21846 |  0  |   7   |  21845 |
+| 35+  |  21845 |  1  |   4   | -21846 |
+| 36   |  21845 |  1  |   4   |  21845 |
+| 36+  | -21846 |  1  |   5   |  21845 |
+| 37   | -21846 |  1  |   5   | -21846 |
+| 37+  | -21846 |  0  |   0   |  21845 |
+| 38   | -21846 |  0  |   0   |  21845 |
+| 38   | -21846 |  0  |   1   |  21845 |
+| 38   | -21846 |  0  |   2   |  21845 |
+| 38   | -21846 |  0  |   3   |  21845 |
+| 38   | -21846 |  0  |   4   |  21845 |
+| 38   | -21846 |  0  |   5   | -21846 |
+| 38   | -21846 |  0  |   6   |  21845 |
+| 38   | -21846 |  0  |   7   |  21845 |
+| 38+  |  21845 |  1  |   5   | -21846 |
+| 39   |  21845 |  1  |   5   |  21845 |
+| 39+  | -21846 |  1  |   6   |  21845 |
+| 40   | -21846 |  1  |   6   | -21846 |
+| 40+  | -21846 |  0  |   0   |  21845 |
+| 41   | -21846 |  0  |   0   |  21845 |
+| 41   | -21846 |  0  |   1   |  21845 |
+| 41   | -21846 |  0  |   2   |  21845 |
+| 41   | -21846 |  0  |   3   |  21845 |
+| 41   | -21846 |  0  |   4   |  21845 |
+| 41   | -21846 |  0  |   5   |  21845 |
+| 41   | -21846 |  0  |   6   | -21846 |
+| 41   | -21846 |  0  |   7   |  21845 |
+| 41+  |  21845 |  1  |   6   | -21846 |
+| 42   |  21845 |  1  |   6   |  21845 |
+| 42+  | -21846 |  1  |   7   |  21845 |
+| 43   | -21846 |  1  |   7   | -21846 |
+| 43+  | -21846 |  0  |   0   |  21845 |
+| 44   | -21846 |  0  |   0   |  21845 |
+| 44   | -21846 |  0  |   1   |  21845 |
+| 44   | -21846 |  0  |   2   |  21845 |
+| 44   | -21846 |  0  |   3   |  21845 |
+| 44   | -21846 |  0  |   4   |  21845 |
+| 44   | -21846 |  0  |   5   |  21845 |
+| 44   | -21846 |  0  |   6   |  21845 |
+| 44   | -21846 |  0  |   7   | -21846 |
+| 44+  |  21845 |  1  |   7   | -21846 |
+| 45   |  21845 |  1  |   7   |  21845 |
+| 45+  |  21845 |  0  |   0   |  21845 |
+| 46   |  21845 |  0  |   0   |  21845 |
+| 46   |  21845 |  0  |   1   |  21845 |
+| 46   |  21845 |  0  |   2   |  21845 |
+| 46   |  21845 |  0  |   3   |  21845 |
+| 46   |  21845 |  0  |   4   |  21845 |
+| 46   |  21845 |  0  |   5   |  21845 |
+| 46   |  21845 |  0  |   6   |  21845 |
+| 46   |  21845 |  0  |   7   |  21845 |
diff --git a/projects/03/a/RAM8.hdl b/projects/03/a/RAM8.hdl
new file mode 100644
index 0000000..4c0e070
--- /dev/null
+++ b/projects/03/a/RAM8.hdl
@@ -0,0 +1,19 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/RAM8.hdl
+
+/**
+ * Memory of 8 registers, each 16 bit-wide. Out holds the value
+ * stored at the memory location specified by address. If load==1, then 
+ * the in value is loaded into the memory location specified by address 
+ * (the loaded value will be emitted to out from the next time step onward).
+ */
+
+CHIP RAM8 {
+    IN in[16], load, address[3];
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+}
+\ No newline at end of file
diff --git a/projects/03/a/RAM8.tst b/projects/03/a/RAM8.tst
new file mode 100644
index 0000000..9b6069c
--- /dev/null
+++ b/projects/03/a/RAM8.tst
@@ -0,0 +1,560 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/RAM8.tst
+
+load RAM8.hdl,
+output-file RAM8.out,
+compare-to RAM8.cmp,
+output-list time%S1.4.1 in%D1.6.1 load%B2.1.2 address%D3.1.3 out%D1.6.1;
+
+set in 0,
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+tick,
+output;
+tock,
+output;
+
+set in 11111,
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+set address 1,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+
+set in 3333,
+set address 3,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set address 1,
+eval,
+output;
+
+set in 7777,
+tick,
+output;
+tock,
+output;
+
+set load 1,
+set address 7,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+tick,
+output;
+tock,
+output;
+
+set address 3,
+eval,
+output;
+
+set address 7,
+eval,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set in %B0101010101010101,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+tick,
+output,
+tock,
+output;
+set address 2,
+tick,
+output,
+tock,
+output;
+set address 3,
+tick,
+output,
+tock,
+output;
+set address 4,
+tick,
+output,
+tock,
+output;
+set address 5,
+tick,
+output,
+tock,
+output;
+set address 6,
+tick,
+output,
+tock,
+output;
+set address 7,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 0,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 0,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 1,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 1,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 2,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 2,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 3,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 3,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 4,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 4,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 5,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 5,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 6,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 6,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+set address 7,
+set in %B1010101010101010,
+tick,
+output;
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
+set load 1,
+set address 7,
+set in %B0101010101010101,
+tick,
+output,
+tock,
+output;
+
+set load 0,
+set address 0,
+tick,
+output;
+tock,
+output;
+set address 1,
+eval,
+output;
+set address 2,
+eval,
+output;
+set address 3,
+eval,
+output;
+set address 4,
+eval,
+output;
+set address 5,
+eval,
+output;
+set address 6,
+eval,
+output;
+set address 7,
+eval,
+output;
+
diff --git a/projects/03/a/Register.cmp b/projects/03/a/Register.cmp
new file mode 100644
index 0000000..a899f27
--- /dev/null
+++ b/projects/03/a/Register.cmp
@@ -0,0 +1,149 @@
+| time |   in   |load |  out   |
+| 0+   |      0 |  0  |      0 |
+| 1    |      0 |  0  |      0 |
+| 1+   |      0 |  1  |      0 |
+| 2    |      0 |  1  |      0 |
+| 2+   | -32123 |  0  |      0 |
+| 3    | -32123 |  0  |      0 |
+| 3+   |  11111 |  0  |      0 |
+| 4    |  11111 |  0  |      0 |
+| 4+   | -32123 |  1  |      0 |
+| 5    | -32123 |  1  | -32123 |
+| 5+   | -32123 |  1  | -32123 |
+| 6    | -32123 |  1  | -32123 |
+| 6+   | -32123 |  0  | -32123 |
+| 7    | -32123 |  0  | -32123 |
+| 7+   |  12345 |  1  | -32123 |
+| 8    |  12345 |  1  |  12345 |
+| 8+   |      0 |  0  |  12345 |
+| 9    |      0 |  0  |  12345 |
+| 9+   |      0 |  1  |  12345 |
+| 10   |      0 |  1  |      0 |
+| 10+  |      1 |  0  |      0 |
+| 11   |      1 |  0  |      0 |
+| 11+  |      1 |  1  |      0 |
+| 12   |      1 |  1  |      1 |
+| 12+  |      2 |  0  |      1 |
+| 13   |      2 |  0  |      1 |
+| 13+  |      2 |  1  |      1 |
+| 14   |      2 |  1  |      2 |
+| 14+  |      4 |  0  |      2 |
+| 15   |      4 |  0  |      2 |
+| 15+  |      4 |  1  |      2 |
+| 16   |      4 |  1  |      4 |
+| 16+  |      8 |  0  |      4 |
+| 17   |      8 |  0  |      4 |
+| 17+  |      8 |  1  |      4 |
+| 18   |      8 |  1  |      8 |
+| 18+  |     16 |  0  |      8 |
+| 19   |     16 |  0  |      8 |
+| 19+  |     16 |  1  |      8 |
+| 20   |     16 |  1  |     16 |
+| 20+  |     32 |  0  |     16 |
+| 21   |     32 |  0  |     16 |
+| 21+  |     32 |  1  |     16 |
+| 22   |     32 |  1  |     32 |
+| 22+  |     64 |  0  |     32 |
+| 23   |     64 |  0  |     32 |
+| 23+  |     64 |  1  |     32 |
+| 24   |     64 |  1  |     64 |
+| 24+  |    128 |  0  |     64 |
+| 25   |    128 |  0  |     64 |
+| 25+  |    128 |  1  |     64 |
+| 26   |    128 |  1  |    128 |
+| 26+  |    256 |  0  |    128 |
+| 27   |    256 |  0  |    128 |
+| 27+  |    256 |  1  |    128 |
+| 28   |    256 |  1  |    256 |
+| 28+  |    512 |  0  |    256 |
+| 29   |    512 |  0  |    256 |
+| 29+  |    512 |  1  |    256 |
+| 30   |    512 |  1  |    512 |
+| 30+  |   1024 |  0  |    512 |
+| 31   |   1024 |  0  |    512 |
+| 31+  |   1024 |  1  |    512 |
+| 32   |   1024 |  1  |   1024 |
+| 32+  |   2048 |  0  |   1024 |
+| 33   |   2048 |  0  |   1024 |
+| 33+  |   2048 |  1  |   1024 |
+| 34   |   2048 |  1  |   2048 |
+| 34+  |   4096 |  0  |   2048 |
+| 35   |   4096 |  0  |   2048 |
+| 35+  |   4096 |  1  |   2048 |
+| 36   |   4096 |  1  |   4096 |
+| 36+  |   8192 |  0  |   4096 |
+| 37   |   8192 |  0  |   4096 |
+| 37+  |   8192 |  1  |   4096 |
+| 38   |   8192 |  1  |   8192 |
+| 38+  |  16384 |  0  |   8192 |
+| 39   |  16384 |  0  |   8192 |
+| 39+  |  16384 |  1  |   8192 |
+| 40   |  16384 |  1  |  16384 |
+| 40+  | -32768 |  0  |  16384 |
+| 41   | -32768 |  0  |  16384 |
+| 41+  | -32768 |  1  |  16384 |
+| 42   | -32768 |  1  | -32768 |
+| 42+  |     -2 |  0  | -32768 |
+| 43   |     -2 |  0  | -32768 |
+| 43+  |     -2 |  1  | -32768 |
+| 44   |     -2 |  1  |     -2 |
+| 44+  |     -3 |  0  |     -2 |
+| 45   |     -3 |  0  |     -2 |
+| 45+  |     -3 |  1  |     -2 |
+| 46   |     -3 |  1  |     -3 |
+| 46+  |     -5 |  0  |     -3 |
+| 47   |     -5 |  0  |     -3 |
+| 47+  |     -5 |  1  |     -3 |
+| 48   |     -5 |  1  |     -5 |
+| 48+  |     -9 |  0  |     -5 |
+| 49   |     -9 |  0  |     -5 |
+| 49+  |     -9 |  1  |     -5 |
+| 50   |     -9 |  1  |     -9 |
+| 50+  |    -17 |  0  |     -9 |
+| 51   |    -17 |  0  |     -9 |
+| 51+  |    -17 |  1  |     -9 |
+| 52   |    -17 |  1  |    -17 |
+| 52+  |    -33 |  0  |    -17 |
+| 53   |    -33 |  0  |    -17 |
+| 53+  |    -33 |  1  |    -17 |
+| 54   |    -33 |  1  |    -33 |
+| 54+  |    -65 |  0  |    -33 |
+| 55   |    -65 |  0  |    -33 |
+| 55+  |    -65 |  1  |    -33 |
+| 56   |    -65 |  1  |    -65 |
+| 56+  |   -129 |  0  |    -65 |
+| 57   |   -129 |  0  |    -65 |
+| 57+  |   -129 |  1  |    -65 |
+| 58   |   -129 |  1  |   -129 |
+| 58+  |   -257 |  0  |   -129 |
+| 59   |   -257 |  0  |   -129 |
+| 59+  |   -257 |  1  |   -129 |
+| 60   |   -257 |  1  |   -257 |
+| 60+  |   -513 |  0  |   -257 |
+| 61   |   -513 |  0  |   -257 |
+| 61+  |   -513 |  1  |   -257 |
+| 62   |   -513 |  1  |   -513 |
+| 62+  |  -1025 |  0  |   -513 |
+| 63   |  -1025 |  0  |   -513 |
+| 63+  |  -1025 |  1  |   -513 |
+| 64   |  -1025 |  1  |  -1025 |
+| 64+  |  -2049 |  0  |  -1025 |
+| 65   |  -2049 |  0  |  -1025 |
+| 65+  |  -2049 |  1  |  -1025 |
+| 66   |  -2049 |  1  |  -2049 |
+| 66+  |  -4097 |  0  |  -2049 |
+| 67   |  -4097 |  0  |  -2049 |
+| 67+  |  -4097 |  1  |  -2049 |
+| 68   |  -4097 |  1  |  -4097 |
+| 68+  |  -8193 |  0  |  -4097 |
+| 69   |  -8193 |  0  |  -4097 |
+| 69+  |  -8193 |  1  |  -4097 |
+| 70   |  -8193 |  1  |  -8193 |
+| 70+  | -16385 |  0  |  -8193 |
+| 71   | -16385 |  0  |  -8193 |
+| 71+  | -16385 |  1  |  -8193 |
+| 72   | -16385 |  1  | -16385 |
+| 72+  |  32767 |  0  | -16385 |
+| 73   |  32767 |  0  | -16385 |
+| 73+  |  32767 |  1  | -16385 |
+| 74   |  32767 |  1  |  32767 |
diff --git a/projects/03/a/Register.hdl b/projects/03/a/Register.hdl
new file mode 100644
index 0000000..926b99f
--- /dev/null
+++ b/projects/03/a/Register.hdl
@@ -0,0 +1,18 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/Register.hdl
+
+/**
+ * 16-bit register:
+ * If load[t] == 1 then out[t+1] = in[t]
+ * else out does not change
+ */
+
+CHIP Register {
+    IN in[16], load;
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+}
diff --git a/projects/03/a/Register.tst b/projects/03/a/Register.tst
new file mode 100644
index 0000000..aeec166
--- /dev/null
+++ b/projects/03/a/Register.tst
@@ -0,0 +1,569 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/03/a/Register.tst
+
+load Register.hdl,
+output-file Register.out,
+compare-to Register.cmp,
+output-list time%S1.4.1 in%D1.6.1 load%B2.1.2 out%D1.6.1;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in -32123,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 11111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in -32123,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in -32123,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in -32123,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 12345,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set in 0,
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000000001,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000000010,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000000100,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000001000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000010000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000000100000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000001000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000010000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000000100000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000001000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000010000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0000100000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0001000000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0010000000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0100000000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1000000000000000,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111111110,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111111101,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111111011,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111110111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111101111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111111011111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111110111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111101111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111111011111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111110111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111101111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1111011111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1110111111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1101111111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B1011111111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;
+
+set in %B0111111111111111,
+set load 0,
+tick,
+output;
+
+tock,
+output;
+
+set load 1,
+tick,
+output;
+
+tock,
+output;