Memory data register
Encyclopedia : M : ME : MEM : Memory data register
The memory data register (MDR) is the register of a computer's control unit that contains the contents of a register to fetch or store from or to the computer storage.
The memory data register is half of a minimal interface between a microprogram and computer storage. The other half is a memory address register.
Far more complex memory interfaces exist, but this is the simplest that can work.
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