Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 A memory write cycle
 An I/O read cycle
 A memory read cycle
 An op-code fetch cycle

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Microprocessor
When RET instruction is executed by any subroutine then

 the top of the stack will be popped out and assigned to the PC.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction.

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