revision

system architecture

• key words:
• von Neumann architecture
• MAR (memory address register)
• MDR (memory data register)
• program counter
• accumulator
• ALU (arithmetic logic unit)
• CU (control unit)
• cache
• fetch/execute
• busses

computer systems

• internal components
• the processor
• main memory (RAM,ROM,EEPROM)
• I/O controllers
• buses
• external components (peripherals)
• keyboard , mouse, printer, disk drives
• I/O Devices / I/O ports
• secondary storage

The processor

• The 'brains' of the computer
• carries out instructions (executes instructions )
• main memory
• Ram-Random access memory