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Registers
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Total cards: 6•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (6)
#1
Front (Question)
What is the role of the accumulator?
Back (Answer)
The special register used as temporary storage by the ALU
#2
Front (Question)
What is the role of the SR?
Back (Answer)
Used to hold the status of various flags indicating • a positive/negative result • carry bit used • overflow error • interrupt status
#3
Front (Question)
What is the role of the PC?
Back (Answer)
Register that holds the address of the next instruction to be fetched
#4
Front (Question)
What is the role of the MAR?
Back (Answer)
Holds the address of the next instruction to be fetched
#5
Front (Question)
What is the role of the MBR?
Back (Answer)
Holds the instruction from the MAR and the associated data.
#6
Front (Question)
What is the role of the CIR?
Back (Answer)
Used to store the instruction that is to be decoded and executed.