Computing Revision

Computing Revision

1. Registers

   • MDR
     • Hold the data that has been retrieved from memory, or that is about to be stored in memory
   • CIR
     • The CIR is used to store the current instruction that the CPU is working on
   • Accumulator
     • Holds the result of calculations and operations performed by the ALU
   • PC
     • Holds the memory location address of the next instruction to be performed by the CPU. The PC does not store the instruction itself
   • MAR
     • Holds the address of the location in memory where data is to be retrieved or stored

2. Buses

   • Data
     • The data bus retrieves data and instructions from main memory
   • Address
     • The address bus sends addresses to the main memory
   • Control
     • The control bus sends control signals to other devices inside the computer system

3. Pipelining

   • The process of receiving another instruction while another one is being decoded