National Soft Test Database System Engineer Tutorial (2nd edition) 1th Chapter computer system knowledge

1. Basic knowledge of computer system
   
   1. Computer system hardware basic components five parts (arithmetic, controller, memory, input device, output device)

CUP (central processing Unit): Centralized processing, arithmetic, controller and other components integration.

Memory: Memory device, divided into: internal memory and external memory,

Input and output devices: external devices (peripherals)

2. Central processing Unit

1.CUP function: A: Program control; b: Operation controls; C: Time control; d: Data processing

2.CPU composition: Arithmetic, controller, register group, internal bus and other parts.

1) Operator: arithmetic logic unit (ALU), accumulator Register, data buffer Register, state condition register, arithmetic device

operator function: A: arithmetic operation (+-*/); B: logical operation (&|! 0><)

(1) Arithmetic logic unit (ALU)

(2) accumulator Register (AC)

(3) Data buffer (DR)

(4) Status Condition Register (PSW)

2) Controller: Control Cup work, run automation, program execution correctly, handle abnormal events, including: A: Command control logic; B: Sequential control logic; C: Bus control logic; d: Interrupt control logic

　　　　　　　　　　　　

National Soft Test Database System Engineer Tutorial (2nd edition) 1th Chapter computer system knowledge