diff options
| author | Yuchen Pei <me@ypei.me> | 2017-11-29 12:30:41 +0100 |
|---|---|---|
| committer | Yuchen Pei <me@ypei.me> | 2017-11-29 12:30:41 +0100 |
| commit | a000308104aab27c2dde9a306f1bc654b2db4806 (patch) | |
| tree | aecc628e14c1628b5714281437aba18680cdc27b /projects/06/rect | |
first commit
Diffstat (limited to 'projects/06/rect')
| -rw-r--r-- | projects/06/rect/Rect.asm | 35 | ||||
| -rw-r--r-- | projects/06/rect/RectL.asm | 32 |
2 files changed, 67 insertions, 0 deletions
diff --git a/projects/06/rect/Rect.asm b/projects/06/rect/Rect.asm new file mode 100644 index 0000000..6cbbaeb --- /dev/null +++ b/projects/06/rect/Rect.asm @@ -0,0 +1,35 @@ +// 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/06/rect/Rect.asm
+
+// Draws a rectangle at the top-left corner of the screen.
+// The rectangle is 16 pixels wide and R0 pixels high.
+
+ @0
+ D=M
+ @INFINITE_LOOP
+ D;JLE
+ @counter
+ M=D
+ @SCREEN
+ D=A
+ @address
+ M=D
+(LOOP)
+ @address
+ A=M
+ M=-1
+ @address
+ D=M
+ @32
+ D=D+A
+ @address
+ M=D
+ @counter
+ MD=M-1
+ @LOOP
+ D;JGT
+(INFINITE_LOOP)
+ @INFINITE_LOOP
+ 0;JMP
diff --git a/projects/06/rect/RectL.asm b/projects/06/rect/RectL.asm new file mode 100644 index 0000000..e97c09b --- /dev/null +++ b/projects/06/rect/RectL.asm @@ -0,0 +1,32 @@ +// 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/06/rect/RectL.asm
+
+// Symbol-less version of the Rect.asm program.
+
+@0
+D=M
+@23
+D;JLE
+@16
+M=D
+@16384
+D=A
+@17
+M=D
+@17
+A=M
+M=-1
+@17
+D=M
+@32
+D=D+A
+@17
+M=D
+@16
+MD=M-1
+@10
+D;JGT
+@23
+0;JMP
|