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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.
+
+
+
+//At first we set n
+(Infinite)
+
+
+@KBD
+D = M
+@BLACK
+D; JGT // if D > 0 then turns black
+
+//TURNS WHITE
+@i
+M = 0
+@SCREEN
+D = A
+@KBD
+D = A - D
+@n
+M = D
+
+
+@SCREEN       //gets the add of the Screen
+D = A
+@index
+M = D
+
+
+(LOOP1)       //Fills the screen: 8192
+@i
+M = M + 1
+D = M
+@n
+D = D - M
+@END
+D; JGT
+@index
+A = M
+M = 0
+@1
+D = A
+@index
+M = D + M
+@LOOP1
+0; JMP
+
+
+
+// TURNS BLACK
+(BLACK)
+@i
+M = 0
+@SCREEN
+D = A
+@KBD
+D = A - D
+@n
+M = D
+
+
+@SCREEN       //gets the add of the Screen
+D = A
+@index
+M = D
+
+
+(LOOP2)       //Fills the screen: 8096
+@i
+M = M + 1
+D = M
+@n
+D = D - M
+@END
+D; JGT
+@index
+A = M
+M = -1
+@1
+D = A
+@index
+M = D + M
+@LOOP2
+0; JMP
+
+
+//runs an infinite loop
+(END)
+@Infinite
+0; JMP
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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/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.)
+//
+// This program only needs to handle arguments that satisfy
+// R0 >= 0, R1 >= 0, and R0*R1 < 32768.
+
+// Put your code here.
+
+
+
+@R2
+M = 0
+(LOOP)
+@R0
+D = M
+@END
+
+
+D; JEQ
+@R0
+M = M - 1
+@R1
+D = M
+(END)
+@R2
+M = M + D
+@LOOP
+0; JMP
+(END)
+//(END)
+@END
+0; JMP
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+# 第四章：Hack Machine language
+
+> 本章内容：了解一台Computer所需要的所有基本部件：CPU，ROM，RAM，I/O deivices。然后完成部件，并且最后搭建成hack computer。
+
+
+
+<img src="/Users/wocaibujiaoquanmei/iCloud 云盘（归档）/GitHub/nand2tetris/Images/hack_contents.png" alt="image-20211011201932143" style="zoom:50%;" />
+
+**内存地址空间的分布：（在hack computer的架构中，指令内存和数据内存是分割开的）**
+
+- 指令地址空间
+- 数据地址空间
+
+
+
+**指令类型（只有两种）：**
+
+- A- 指令： 地址指令
+  - 用法：`@value`
+
+- C- 指令： 计算指令
+  - 用法:  `dest = comp ; jump`
+
+**@value语法：**
+
+- 导致$A$寄存器的值更新为$value$
+- 导致被隐式选择的寄存器为$M[A]$(side effect)：也就是说$M$默认为$M[A]$
+- 该指令还可用于创建变量和标签
+
+
+
+**`C指令`各位域详解：**
+
+![image-20211011190905670](/Users/wocaibujiaoquanmei/Library/Application Support/typora-user-images/image-20211011190905670.png)
+
+**一些预定义的标签：**
+
+![image-20211011201712082](/Users/wocaibujiaoquanmei/iCloud 云盘（归档）/GitHub/nand2tetris/Images/hack_builtin_symbols.png)
+
+
+
+其中比较重要的有：**分支**和**循环**。
+
+该操作都通过核心的`jump`指令来完成。
+
+
+
+**I/O内存映射**
+
+<img src="/Users/wocaibujiaoquanmei/iCloud 云盘（归档）/GitHub/nand2tetris/Images/hack_screenMemory_map.png" alt="image-20211012114001565" style="zoom: 33%;" />
+
+我们的`RAM`是16位的，使用`2^{13}*16`个位，映射为屏幕的`256 * 512`个点阵
+
+
+
+**键盘**
+
+预定义宏`@KBD`代表键盘的占用内存的起始位置，实际上该内存的大小仅为1。
+
+<img src="/Users/wocaibujiaoquanmei/iCloud 云盘（归档）/GitHub/nand2tetris/Images/hack_character_set.png" alt="image-20211012221144778" style="zoom: 50%;" />
+
+**变量的抽象**
+
+本质上是在内存中申请了一片区域，然后通过CPU和GPU等进行各种操作。在hack语言中，通过`A`寄存器指定变量的内存偏移量，然后可以直接通过`M`即`M[A]`来操作A指向的内存区域，使得其值发生改变。
+
+
+
+
+
+#### 源码
+
+`Mulit.asm`: [这里]()
+
+`Fill.asm`：[这里]()