8086 microprocessor

Why does the A20 address line need to be enabled when the real mode is switched to the protection mode (compatibility issues caused by system upgrades) [-1] preface: Complementary: Compatibility refers to the CPU running in the early stage. For example, a program running on 8086/8088 can also run on a later processor, such as 80286; [0] Look at the development history of intel processors The system does not think that its access is out of bounds and

dominated by 32-bit CPU cores. The CPU cores designed by arm are commonly known as "ARM chips ", however, strictly speaking, an ARM chip should be a single-chip microcomputer designed with the CPU core of the arm. An SoC chip made with the CPU core of the arm is generally not called an ARM chip.Therefore, the ARM chip mentioned by the landlord is an advanced general-purpose microcontroller.DSP = digital signal processing, that is, digital signal processing. Like "Arm chip", "DSP chip" is common

One, instruction set architecture:Instruction Set Schema ( English:instruction Set Architecture, abbreviated as ISA), also known as instruction set or instruction collective , is the part of the computer architecture related to program design , including basic data types, instruction sets, registers, addressing modes, storage systems, interrupts, exception handling, and external I/O. The instruction set schema consists of a series of opcode, the opcode (machine language), and the basic commands

basic knowledge of Unix operating system1. What is UNIX? UNIX is a computer operating system, which is a control program used to coordinate, manage and control computer hardware and software resources.What are the features of the 2.Unix operating system? Multi-user and multi-tasking. Multiple users indicate that multiple users can use the UNIX operating system at the same time and do not interfere with each other; multitasking means that any user can perform multiple tasks on UNIX at the same mo

does not confirm whether the destination part received data purpose part reads at a fixed time Regardless of whether you can read the data (there is no data on the bus), or whether the read data is correct (read the data sent by the source part or other messy data) where is the timing? Can be controlled by the central time, or each part comes with the time label, but need to synchronize with the central time mark, like our mobile phone, computer time, each time the ne

Intel X86 architecture The Pentium i-386 is a 32-bit CISC (Complex Instruction computer) processor, but the aplha is based on Risc (short instruction computer ).CodeBut the principles are similar. The processor has many General registers. Registers are storage locations that are of special use in the microprocessor itself. Access registers are much faster than accessing other types of memory. Some registers are common, while others are of special

has become very complex and is a tool with various tools and applications.Program to meet a variety of needs of the operating environment.A far-sighted view of DOS is that it can handle complex features of a variety of complex microprocessor, such as 80386And 80486. In the future, DOS versions can even handle multiple tasks and support multiple users, even though MicrosoftThis information is not explicitly provided. Some may have doubts about this, e

information through an internal or external bus to complete one or more microoperations Instruction cycle A command cycle is the time required to execute a command. It generally consists of several machine cycles. The number of machine cycles varies depending on different commands. For some simple single-byte commands, after the commands are obtained into the instruction register during the instruction fetch cycle, the commands are decoded and executed immediately, and other machine cycles are

The Intel 8086/8088cpu set up a 16-bit flag register, used to reflect the current state of the microprocessor and some of the controls, there are 9 flags in the flag register, divided into two categories: status symbol (CF, PF, AF, ZF, SF, of) and control flags (TF, IF, DF), The status flag is automatically set by the CPU based on the result of the operation, which is used to reflect the result characterist

registers, some of which are special and meaningful. I. General registers A group of eight General registers is a 32-bit extension of the 8086/80286 General Register. Its usage is similar to that in 8086/80286 and supports 8-bit, 16-bit, and 32-bit operations, for 32-bit operations, the register name is preceded by "E ". The eight registers are named as follows: eax (accumulators), EBX (base address), ECx

One:CISC (Complex instruction Set computer) complex instruction computer CISC is the basic processing part of a desktop computer system, and the core of each microprocessor is the circuit that runs the instruction. A command consists of multiple steps to complete a task, transferring the value into a register, or adding an operation. CISC is a microprocessor that executes a complete set of computer instruct

!) Tutorial. Without saying anything, read this article, and you can "inadvertently" sell debug in your predecessors or later generations. It's a great sense of accomplishment. Try it! So what about next? -Here we go! (It doesn't matter if you don't understand it when you read it. It must be broken down in the following sections.) Because assembly is used to communicate with hardware through CPU and memory, so we have to first understand the CPU and memory: (this is not to mention the number of

predecessors or later generations. It's a great sense of accomplishment. Try it! So what about next? -Here we go! (It doesn't matter if you don't understand it during reading. It will be broken down below) Because the Assembly communicates with hardware through CPU and memory, We have to first understand the CPU and memory: (the number-based hexadecimal problem is not mentioned here) CPU is a chip that can execute all arithmetic/logical operations and basic I/O control functions on the compute

"inadvertently" sell debug in your predecessors or later generations. It's a great sense of accomplishment. Try it! So what about next? -Here we go! (It doesn't matter if you don't understand it during reading. It will be broken down below) Because the Assembly communicates with hardware through CPU and memory, We have to first understand the CPU and memory: (the number-based hexadecimal problem is not mentioned here) CPU is a chip that can execute all arithmetic/logical operations and basic I/

predecessors or later generations. It's a great sense of accomplishment. Try it! So what about next? -Here we go! (It doesn't matter if you don't understand it when you read it. It must be broken down in the following sections.) Because assembly is used to communicate with hardware through CPU and memory, so we have to first understand the CPU and memory: (the number hexadecimal problem is not mentioned here)CPU is a chip that can execute all arithmetic/logical operations and basic I/O control

) Because the Assembly communicates with hardware through CPU and memory, We have to first understand the CPU and memory: (the number-based hexadecimal problem is not mentioned here) CPU is a chip that can execute all arithmetic/logical operations and basic I/O control functions on the computer. An assembly language can only be used for a specific CPU. That is to say, the command syntax of different CPU assembly languages is also different. Since its launch in 1981, the CPU development process

configuration, Http://localhost:8086/access.log, can see the nginx/logs/access.log, but do not expect to be able to access the HTML directory of documents server { listen 8086; server_name localhost; Location/{ root logs; }} 2) This configuration, access to Http://localhost:8086/log/access.log, can see Nginx/logs/access.log;Visit http

function of a piece of chip. An assembly language can only be used for a specific CPU. In other words, the different CPU's assembly language instruction syntax is also not the same. PC from 1981 to date, its CPU development process is: 8086→80286→80386→80486→pentium→ ..., as well as AMD, Cyrix and other offshoot. The latter is compatible with the functions of the front CPU, with only a few more instructions (such as a multi-Pentium MMX instruction se

[From: an in-depth understanding of Linux kernel] Linux tries to keep a clear line between hardware-independent source code and hardware-related source code. To achieve this, the arch and include directories contain 23 sub-directories to correspond to different hardware platforms supported by Linux. The standard names of these platforms are as follows: Alpha HP's Alpha workstation was first owned by digital, and later belongs to Compaq, which is no longer produced. Arm, arm26 ARM-based computer

If you have problems installing NETMOS multi-serial port cards, please help solve the problem-Linux general technology-Linux technology and application information. The following is a detailed description. There are two pci netmos serial port cards in the machine, but the system can only find four serial ports and cannot add them by yourself. How can I add them correctly: In DEV, only ttyS0 ttyS1 ttyS2 ttyS3 can be found. Therefore, add ttyS0 to DEV and run the following command: # Mknod ttyS4