36 lines
557 B
NASM
36 lines
557 B
NASM
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/06/rect/Rect.asm
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// Draws a rectangle at the top-left corner of the screen.
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// The rectangle is 16 pixels wide and R0 pixels high.
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@0
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D=M
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@INFINITE_LOOP
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D;JLE
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@counter
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M=D
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@SCREEN
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D=A
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@address
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M=D
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(LOOP)
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@address
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A=M
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M=-1
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@address
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D=M
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@32
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D=D+A
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@address
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M=D
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@counter
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MD=M-1
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@LOOP
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D;JGT
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(INFINITE_LOOP)
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@INFINITE_LOOP
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0;JMP
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