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66 lines
771 B
NASM
66 lines
771 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/04/Fill.asm
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// Runs an infinite loop that listens to the keyboard input.
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// When a key is pressed (any key), the program blackens the screen,
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// i.e. writes "black" in every pixel. When no key is pressed, the
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// program clears the screen, i.e. writes "white" in every pixel.
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// Put your code here.
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(LOOP)
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@KBD
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D=M
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@BLACK
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D;JGT
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@R0
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M=0
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@CONTINUE
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0;JMP
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(BLACK)
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@R0
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M=0
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M=!M
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(CONTINUE)
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@31
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D=A
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@R1
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M=D
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@256
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D=A
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@R2
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M=D
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@SCREEN
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D=A
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@R3
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M=D
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(FILL)
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@R0
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D=M
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@R3
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A=M
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M=D
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D=A+1
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@R3
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M=D
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@R1
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DM=M-1
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@ENDOFLINE
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D;JEQ
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@FILL
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0;JMP
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(ENDOFLINE)
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@32
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D=A
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@R1
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M=D
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@R2
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DM=M-1
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@ENDOFSCREEN
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D;JEQ
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@FILL
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0;JMP
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(ENDOFSCREEN)
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@LOOP
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0;JMP |