Introduction to assembly language

工欲善其事, its prerequisite. Assembly language is our learning, interface principle, the principle of microcomputer composition, such as the basis of a number of interesting courses. Unfortunately, however, people who have just come into contact with the Assembly always feel that it is difficult, good trouble, a lot, a good abuse of heart, a good brain abuse. So, Beholder!!! In fact, the assembly is not as difficult and interesting as it is imagined. Of course, it's not as simple as it might seem.

Recommend a textbook first! Wang Shuang's "assembly language". This book is more suitable for getting started, because the book tries to block a lot of esoteric content. (Even so, it's not easy!) ）。 And then the book that our teacher recommended for us.

: "80x86 assembly Language Programming Program" (Yang Ziwen), "Ibmpchb assembly language", there is a book called "from the assembly language to the computer core" books. In fact, I have not read these books, but the plan is to read at least one.

All right! Let's learn the compilation together happily! (In fact, it is a compilation of quick exams, I put things to try to review and tidy up a bit, but the road to learn the assembly is still very long oh!) ）。

C1: basic knowledge (clock comprehension complement various hardware)

C2: Register (Physical address segment)

C3: Register (Memory Access)

C4: First Program

C5: "BX" and Loop command

C6: A program with multiple segments

C7: A more flexible approach to locating addresses//not studying well

Ah&al=ax (ACCUMULATOR): Cumulative register

BH&BL=BX (Base): Base Address Register

CH&CL=CX (count): Count Register

DH&DL=DX (data): Information register

SP (Stack Pointer): Stack pointer register

BP (base Pointer): Base point pointer Register

SI (source Index): Source Variable address register

DI (Destination Index): Destination variable address register

IP (instruction Pointer): instruction Pointer register

CS (code Segment) Snippet Register

DS (Data Segment): segment Register

SS (Stack Segment): Stack segment Register

ES (Extra Segment): Additional segment Register

FLAG  寄存器中存储的信息通常又被称作程序状态字（PSW） 

The number of overflow flag overflow flag operands exceeds the range indicated by the machine to indicate overflow, which is 1 when overflow. The SF sign flag symbol marks the sign of the result of the operation and results in a negative 1. The ZF zero flag 0 operation result equals 0 o'clock to 1, otherwise 0. CF carry flag carry flag the most significant bit yields a rounding of 1, otherwise 0. AF auxiliary carry flag auxiliary carry flag operation, the 3rd bit to the 4th bit when the rounding is 1, otherwise 0. PF parity flag Parity flag operation results The number of operands is 1 for an even number of 1, otherwise 0. The DF direcion flag direction flag is used for string processing. Df=1, the SI and di are reduced after each operation. The df=0 increases. The IF interrupt flag interrupt flag is if=1, allowing the CPU to respond to a masked interrupt, otherwise shutting down the interrupt. The TF trap flag trap flags are used to debug a single step operation.

Other

Psw:program status word  tcon:timer controlie:interrupt enablescon:serial Control

EA  --effective Address: An address that is valid, that is, an offset.

Sa--segment Address

Introduction to assembly language