Memory Address Register: Holds address of the active memory location. Loaded from the program control register.
Memory Buffer Register: Holds the contents of the memory word read from or written in memory. If it is an instruction word it is transffered to the Instruction register and if a data word, to the accumulator register for operation or to the I/O register. If a word is to be stored in a memory location, it is first transferred to the MBR from where it is written in the memory.
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