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-// 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/04/Fill.asm
-
-// Runs an infinite loop that listens to the keyboard input.
-// When a key is pressed (any key), the program blackens the screen,
-// i.e. writes "black" in every pixel;
-// the screen should remain fully black as long as the key is pressed.
-// When no key is pressed, the program clears the screen, i.e. writes
-// "white" in every pixel;
-// the screen should remain fully clear as long as no key is pressed.
-
-// Put your code here.
-
-(BEGIN)
-@KBD
-D=M
-
-@BLACK
-D;JNE
-
-@WHITE
-0;JMP
-
-(BLACK)
-@8191
-D=A
-@i
-M=D
-
-(LOOPB)
-@i
-D=M
-@j
-M=D
-@SCREEN
-D=A
-@j
-M=M+D
-A=M
-M=-1
-@i
-M=M-1
-D=M
-@LOOPB
-D+1;JGT
-
-@BEGIN
-0;JMP
-
-(WHITE)
-@8191
-D=A
-@i
-M=D
-
-(LOOPW)
-@i
-D=M
-@j
-M=D
-@SCREEN
-D=A
-@j
-M=M+D
-A=M
-M=0
-@i
-M=M-1
-D=M
-@LOOPW
-D+1;JGT
-
-@BEGIN
-0;JMP