Microprocessor
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 the microprocessor can be interrupted by a non-mask able interrupt
 the microprocessor cannot be interrupted by any mask able interrupt
 the microprocessor cannot be interrupted by any interrupt
 all interrupts except non-maskable interrupt are disabled

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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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