Microprocessor
In microprocessor based system DMA refers to

 direct memory access for microprocessor
 direct memory access for the I/O device
 direct memory access for the user
None of these

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Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the operand address.
 shorthand for machine language.
 a short abbreviation for the data word stored at the operand address.
 a short abbreviation for the operation to be performed.

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