Microprocessor
The first machine cycle of an instruction is always

 A fetch cycle
 A memory read cycle
 A memory write cycle
 An I/O read cycle

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

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Microprocessor
A high on RESET OUT signifies that

 all the registers and counters are being reset
 all the registers and counters are being reset and this signal can be used to reset external support chip
 all the registers of the CPU are being reset
 processing can begin when this signal goes high

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