1
Q
PC
A
Keeps track of memory location of the line of machine code
2
Q
MDR
A
Stores the data that has been fetched from or stored in memory
3
Q
MAR
A
Stores the address of the data or instruction that are to be fetched from or sent to.
4
Q
CIR
A
Stores the most recently fetched instruction, waiting to be decoded and executed
5
Q
ACC
A
Stores the results of the calculations made by the ALU
6
Q
ALU
A
Performs arithmetic and logical operations
7
Q
Busses
A
Communication channels through which data can be sent around the computer.
8
Q
Data bus
A
Carries data between the processor and memory
9
Q
Address bus
A
Carries the address of the memory.
10
Q
Control bus
A
Sends control signals from the control unit
Computer Science DD1
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