8086 microprocessor

. From here, the CPU is a series of operations that can be used to process processes.The creation of processes, the destruction of the state of communication between transitions between synchronous asynchronous concurrency and the scheduling of processes. The details are as follows:3.2 Memory 内存的主要作用就是给cpu提供数据，既然是内存那就避免不免的流程： 分配 回收 我们所有的操作也都时围绕这俩点进行的，说道内存的分配那就肯定分为俩中情况： 连续 非连续 类似于数据结构 的线性和非线性。 连续分配内存就是很简单了，就是分配连续的内存，但是分配多少呢，这就是一个问题了，所以就分为固定内存的分配 和动态内存的分配（根据程序，数据 大小），并且采用相关的分配算法。缺点：内存碎片化

8086 assembly on specified page, specified row, specified column, specified color, output specified character 1. Final conclusion: Assume Screen is 80*25 mode Specify page: Ph (16, starting from 0) Specify line: Rh (16-in, starting from 0) Specified column: Ch (16, starting from 0) Specify color: Cob (binary) Specified character: Char Initialize the cache address for the specified location on the screen Segment Address DS initialized to b800h+fah*ph;

The V86 we use below refers to the virtual 8086 mode. In previous tutorials, you learned how to simulate V86 interrupts, but there was one problem that was not resolved: exchanging data between VxD and V86 code. Here we will learn how to use the V86 memory Manager to implement this feature. Download the example program here Theory If your VxD runs with some V86 programs, how to transfer large amounts of data to V86 programs or transfer large amounts

Directive statement: Macros ... EndmMacro_name???? MACRO???? [Parameter_list]???? Parameter Parameter_list Optional, when there are multiple parameters, the middle is separated by commas....EndmMULTIPLY???? MACRO???? OPR1, OPR2, RESULT???? Macro definition, Macro name multiply, parameter opr1,opr2 and result???????? PUSH???? Dx???????? PUSH???? Ax???????? MOV???? AX, OPR1???????? Imul???? OPR2???????? MOV???? RESULT, AX???????? POP???? Ax???????? POP???? DxEndmMULTIPLY???? , BX, SAVE???? Macro

is aaaah.The source operand is relative to the register, and the referenced segment register is in the form SS: "mov bx, [bp-4]"The target operand is in the form of a register relative addressing, and the reference segment registers are SS: "mov es:[bx+5], al"6. Base Address and address method:Operand in memory, the valid address of the operand is obtained from the contents of the base register + the variable address register.When the obtained valid address exceeds FFFFH, it goes to its 64k mod

= The address of the first byte after the address-call instruction at the "label";The range of 16-bit displacement is -32768~32767, which is indicated by complement;16-bit displacement is calculated by the compiler at compile timeCall is equivalent to:Push IPJMP near PTR labelCall far PTR designator:(1) (sp) = (sp) –2((ss) x16+ (sp)) = (CS)(sp) = (sp) –2((ss) x16+ (sp)) = (IP)(2) (CS) = segment address where the label is located(IP) = offset address where the label is locatedEquivalent to:Push

Paving the way for Sandy Bridge This is such a basic law. It should be the first lesson in your computer history: "The number of transistors in an integrated circuit doubles every two years ." However, Moore's Law (Assumption proposed by Intel

The problem is as follows: As the processor's pipeline grows longer and the clock speed increases, the performance loss caused by the branch problem becomes more and more obvious. According to statistics, branch commands account for 10% of the total

The following content is reprinted: First, let's look at a piece of assembly code. LDR R0,=0x56000010 #R0 is set to be register GPBCON and is used to select pin function for Port B #in,out special function and others MOV R1,#0x0000

The definition of ADR is: a small range of addresses read pseudoinstructions, the ADR command reads the address value based on the relative offset of the PC to the register, when the source program is compiled, the ADR directive is replaced by an

0 With embeddedSystemAndNetworkMore and more embeddedDeviceTo achieve Internet network and support the access of embedded devices to the network, it has become an important part of the embedded field.ResearchDirection. A large number of

Arm belongs to RISC instruction set, and x86 is representative of CISC instruction set, the result of compiler generation is more representative. Among them, parameter passing and return values are the most concerned parts of assembly/C mixed

When learning to compile, many beginners do not understand or even understand the way the PC is addressed. Indeed, this knowledge is very abstract, the need for a more powerful space to imagine the ability. Especially when we are typing strings, how

I recently learned the assembly language, because I am using Ubuntu, and the examples in the book are all debugging in the dos environment, so I used Bochs to install freedos for debugging. CentOS6.0 source code compilation and installation of

I. Data Transmission instructionsFunction: transmits data between the memory and registers, registers, and input/output ports. 1. general data transmission commands. moV transfers words or bytes. movsx first extends the symbol and then transmits it.

NextArticleIn this article, we will talk about menory alignment-memory alignment.   I. Why do I need memory alignment?   No matter what I do, I habitually ask myself: Why am I going to do this? Yes, this may also be a question that everyone

Criteria for determining PF:Returns the parity of the low 8-bit computation result. If the number of 1 contained in the low 8-bit computation is an even number, pF = 1Note: "The calculation result is 8 bits low" Of judgment criteria: • How to

  Win32ProgramWhen running in protection mode, the history of protection mode can be traced back to 80286. In Windows, every Win32 application is put to a separate virtual address space for running. That is to say, each application has an

I recently learned the assembly language, because I am using Ubuntu, and the examples in the book are all debugging in the dos environment, so I used Bochs to install freedos for debugging. CentOS 6.0 source code compilation and installation of

Written in front: Also years have not updated the blog ... It's 21 years old. Look back and find the sophomore completely not updated blog ... Many reasons, one is the feeling of finishing blog although can deepen the understanding of learning to