| What are 3 types of buses | address bus, data bus and control bus |
| What does address bus do | transmit signals relating to address between processor and memory |
| What does data bus do? | Transmit data between processor and memory unit and I/O device |
| What does a control bus do? | transmit signals relating to control all activities in the computer |
| What are Memory Unit made up of | partitions, each partition has an address and content (data) |
| What does a processor contain? | ALU arithmetic and logic unit which is used for math operation and logic |
| ALU uses what register? | Accumulator (ACC.) which stores result of calculation |
| How does a control unit work? | it controls the operation of CPU. It reads instruction from memory and the instruction is interpreted and signals are transfer via control bus to tell other components what to do. |
| What is the definition of register | a small amount of high-speed memory containing within CPU |
| What does a PC stand for | Program Counter |
| What does a PC do? | stores current step number in program being executed, points to step of instruction currently being executed |
| What does CIR stand for | Current instruction register |
| What does a CIR do | part of CPU that deletes instruction currently decoded |
| What does MAR stand for | Memory Address Register |
| What does a MAR do | stores memory address from which data is being fetched to CPU |
| What does MDR stand for | Memory Data Register |
| What does a MDR do? | contains data to be stored in computer storage (RAM) |
| What does a ACC do? | holds current piece of data, operation performed which results are stored |
