The Computer System By LoWing Tat (10) 1. System Unit 1.1 Central processing unit(CPU) 1.2 Memory 1.1 Central processing unit(CPU) 1. What is Central processing unit(CPU)? 2. What does CPU look like? 3. What does CPU contains?
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By LoWing Tat (10)
1.1 Central processing unit(CPU)
1. SEC cartridge 2. Square PGA
*1 Chip : The term "chip", "computer chip" and "microchip" originated as technical jargon for Integrated Circuit (IC), which is a super thin slice of semi-conducting material packed with microscopic circuit elements such as wires, transistors, capacitors, logic gates and resistors.
1. sending and receiving control signals to and from peripheral devices
2. interpreting the instructions stored in main memory
3. regulating the timing of all operations performed within the CPU
4. sequencing the instructions to be executed
5.controlling the flow of data between the CPU, main memory and peripheral devices.
*2 Instruction Register : A register is a storage unit which has a specified storagecapacity. It is used for temporary storage of instructions, data and addresses. An instruction register(IR) is a register that holds the current instructions fetched from main memory.
*3 Instruction decoder : An instruction decoder is a logic circuit which interprets the current instructions stored in the instruction register.
*4 program counter(PC) : A program counter(PC) is a register which holds the address of the next instruction to be accessed after the current instruction has been fetched.
*5 Accumulator :An accumulator(ACC) is a register which temporarily holds the intermediate or final result of arithmetic and logical operations.
*6 Status Register : A status regidter(SR) describes the status of the current contents of the accumulator and holds a collection of bits.
1. What is Memory?
1. RAMand 2. ROM.
The RAM holds instructions and data temporary while the ROM holds system programs and data permanently.
2.1 Input devices
2.2 Output devices
2.3 Storage devices
1. Keyboards ,
2. Pointing Devices ( i. Mouse, ii. touch screen, iii. light pen, iv. digitizer ),
3. Scanning devices (i. image scanner, ii. fax machine, iii. bar-code scanner, iv. magnetic ink character recognition, v. optical character recognition, vi. optical mark recognition ),
4. voice - input devices ,
5. Chinese hand writing recognition device
It is designed for the purpose for saving time and reducing errors.
Pointing Devices containing:
Magnetic tape is a thin ribbon of plastic with magnetic coating on one side.
3.2 Network devices
3.3 Local area network
4.1 Operating system
4.2 Utility programs
5.1 Custom-made software
5.2 Packaged software