The System Unit of a Computer System
Periphearls
Input
Output
Storage
Communication
System Unit
Power Supply
Motherboard
Storage Device
CPU
Control Unit (CU)
Arithmetic and Logical Unit (ALU)
Registers
General Purpose Registers (GPRs)
Accumulator (AX)
Base register (BX)
Counter (CX)
Data register (DX)
Control Registers
Instruction Register (IR)
Program Counter (PC)
Memory Access Register (MAR)
Memory Data Register (MDR)
Status Registers
System bus (bus line)
Data bus
Address bus
Control bus
Machine cycle
Fetch
Decode
Execute
Interrupt
Clock rate
Word length
Main Memory
Random Access Memory (RAM)
Read-only Memory (ROM)
Erasable programmable ROM (EPROM)
Electrically erasable programmable ROM (EEPROM)