multi:
// 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.
@2 // r2=0(歸0)
M=0
@0 //r0=M
D=M
@21 //IF r0=0 , 跳至 r21結束 0*任何數=0
D;JEQ
@1 //r1=M
D=M
@3
M=D //計算次數(最後會歸0)
@21 //IF r1=0,跳至 r21結束 任何數*0=0
D;JEQ
@14 //LOOP
D;JNE
@0
D=M
@2
M=M+D // 相加x次(乘法)
@3
M=M-1
D=M
@12 //LOOP
D;JNE
@21 //卡迴圈
0;JMP
Fill:
// 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.
//16384>>螢幕
//24576>>鍵盤
@8192 //所有螢幕範圍
D=A
@0
M=D
@24576
D=M
@18
D;JNE // 按下鍵盤(out!=0) 跳至 18
@0
D=M
M=M-1
@0
D;JEQ //IF 輸出==0 跳至 0
@16383 //16384開始是螢幕
A=D+A
M=0
@8
0;JMP //開始下次迴圈
//畫黑線
@0
D=M
M=M-1
@0
D;JEQ //IF 輸出==0 跳至 0
@24576
A=A-D
M=-1
@18
0;JMP //開始下次迴圈
