Microprocessor
In microprocessor based system I/O ports are used to interface

 the I/O devices and memory chips
 the I/P device only
 all the I/O devices
 the O/P devices only

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Microprocessor
When referring to instruction words, a mnemonic is

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

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