fill

看完有寫出

// 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.

@24576  
D=M     
@0
D;JEQ   

@8192  
D=A    
@10    
M=D

@16384
D=A
A=D
D=D+1  
M=-1   

@10    
M=M-1  
M;JNE  

@24576 
D=M   
@16    
D;JNE  

@8192  
D=A
@26
M=D

@16384 
D=A
A=D
D=D+1
M=0 

@26
M=M-1
M;JNE

@0
0;JMP

mult

看完沒寫出

// 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/Mult.asm

// Multiplies R0 and R1 and stores the result in R2.
// (R0, R1, R2 refer to RAM[0], RAM[1], and RAM[2], respectively.)

// Put your code here.

@0
D=A
@R2
M=D 

(loop)

@R0
D=M
@exit1
D; JLE

@R1
D=M 
@R2
M=D+M

@R0
M=M-1

@loop
0;JMP

(exit1)
@exit1
0;JMP