Computer Architecture

Computer Architecture

1. Components external to the CPU are peripherals

   • Eg VDU, Disk, Memory, Keyboard

2. 3 Box Model

3. Main Memory

   • I.A.S Immediate Access Store

4. EEPROM (Electrically erasable programmable read-only memory)

   • Use for non-volatile storage eg. in Sim cards
   • Very Slow write times
   • Require hard clear of memory with specific waves length of light

5. Bus

   • Address bus: unidirectional, addresses memory and I/O locations
   • Control bus:

6. CPU Registers

   • Program Counter (PC)
   • Memory Address Register (MAR)
   • Status Register (SR)
   • Current Instruction Register (CIR)
   • Memory Data Register (MDR)
   • Memory Buffer Register (MBR)

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