diff options
| author | Frederick Yin <fkfd@fkfd.me> | 2022-08-16 11:54:23 +0800 |
|---|---|---|
| committer | Frederick Yin <fkfd@fkfd.me> | 2022-08-16 11:54:23 +0800 |
| commit | 9542deeb483a00b6fabed7574720926ce97d7511 (patch) | |
| tree | 0f2c1f72c03dd4693fd59df67544d2a4dddc5494 /projects/06/rect/Rect.asm | |
| parent | 9c0cb1d1c32724fc95ac9548e4f8d873d3adaccc (diff) | |
Projects, 01-06 completed
Diffstat (limited to 'projects/06/rect/Rect.asm')
| -rw-r--r-- | projects/06/rect/Rect.asm | 35 |
1 files changed, 35 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
|