| ALU | Arithmetic Logic Unit | execute arithmetic and logic operations |
| Control Unit | Control Unit | control operation of all other components |
| Registers | Registers | small storage areas for data |
| PC | Program Counter | address of next instruction |
| IR | Instruction Register | instruction being executed |
| MAR | Memory Address Register | memory address of data to be read/written |
| MBR | Memory Buffer Register | data to be read/written to/from memory |
| I/O AR | I/O Address Register | I/O device to be used |
| I/O BR | I/O Buffer Register | data to be input/output |
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