From a000308104aab27c2dde9a306f1bc654b2db4806 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Wed, 29 Nov 2017 12:30:41 +0100
Subject: first commit

---
 projects/06/rect/Rect.asm  | 35 +++++++++++++++++++++++++++++++++++
 projects/06/rect/RectL.asm | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 projects/06/rect/Rect.asm
 create mode 100644 projects/06/rect/RectL.asm

(limited to 'projects/06/rect')

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
-- 
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