1) what does MAR mean a) Memory Address Register b)  Momery Adress Rigestor c) Memory data Register d) Main accumulator Register  2) what does the MDR do? a) holds the contents found at the address held in the MAR b) more dive resources  c) holds the address of the current instruction d) Memory drive 3) What does CPU stand for? a) Computer Program unit b) central processing unit c) computer processing unit  d) central program unit 4) where is the program counter? a) hard drive b) ROM c) CPU d) RAM 5) where is virtual storage? a) registers b) RAM c) Cache d) hard drive

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