Computer Basics 01 Comments
1, CPU Detailed
Classification and instruction set of the CPU
x86-64 (focus)
- x86: refers to the CPU model
- 64: How much cpu-time instruction fetched from memory the number of bits, that is capable of taking out a maximum of 64 binary.
内存基于电信号工作，所以认为的定义，高电频代表数字1，低电频代表数字0，这就是就是二进制的由来。
cpu具有向下兼容性，cpu的取指令集数，取决于内存提供的指令集数。举个例子：cpu与内存的关系就像车道与车的关系，车道：cpu的每次读取指令集数量 车：内存最大提供给cpu的指令集数，车道能越宽，一次性能容纳车的个数也就越多。也就是说64位的cpu能读取每次性提供32位或64位指令集的内存，而32位的cpu只能读取每次提供32位指令集的内存。
拓展：64位的cpu读取提供32位指令集的内存，会在32位之前补全32个0。
Kernel mode and user mode (focus)
Multi-threading and multi-core chips
2, the memory
RAM
ROM
CMOS
hard disk
Mechanical hard drive
SSD
IO delay (focus)
Virtual Memory
3, bus
4, the operating system boot process (focus)
5, start the application process (focus)