Learn from the Linux learning of Brother Bird (1)--Introduction to Calculator

Before a period of time to see the brother of the Linux private dishes, feel well written, is a very good first knowledge of the Linux system books. The next day I'll be describing the key knowledge of each chapter of the book, as well as an experience of learning the book. Today, in the overview section, given that Linux is an operating system, it is necessary to introduce computer knowledge first.

1. The computer consists of the following parts: input unit, Output Unit, control unit inside CPU, arithmetic logic unit and main memory. can be described by.

The main introduction of the next CPU section, CPU has two categories: thin instruction set RISC and complex instruction set CISC.

2. One of the issues in this chapter attracts my attention, and is not clear before, that is why the purchase of 2GU disk, but the actual only 1.7g or so? This is because the hard drive manufacturer uses 10 binary units, so 2G represents the meaning of 2*1000*1000*1000 bytes. The capacity unit of the file is converted to binary (1024 is the bottom), so it is only about 1.7G.

3. The minimum physical capacity of a hard disk in a computer is 512 bytes, and the smallest constituent unit is a sector.

4. The main memory component of the computer is dynamic random access memory (DRAM), the random access memory can only be used when the power is on, the data disappears after the power loss, so the DRAM is also called the volatile memory. ROM is a non-volatile memory, in addition, the BIOS is very important for the computer, because he is the system at the start of the first to read a small program. The BIOS is a program written to a piece of flash or EEPROM on the motherboard, which can run at boot time to load CMOS parameters and attempt to call the boot loader in the storage unit for further entry into the operating system. A common desktop computer is to use the DEL key to enter the BIOS settings screen.

5. In general, OS OS is also a set of programs that focus on managing all of the computer's activities and driving all the hardware in the system.

Learn from the Linux learning of Brother Bird (1)--Introduction to Calculator