Microprocessor
Which of the following statements for intel 8085 is correct?

 PC specifies the address of the instruction to be executed
 Program Counter (PC) specifies the address of the instruction last executed
 PC specifies the number of instructions executed so far
 PC specifies the address of the instruction being executed

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Microprocessor
IN an intel 8085A microprocessor, why is READY signal used?

 To slow down a fast peripheral device so as to communicate at the microprocessor’s device.
 To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device.
None of these
 To indicate to user that the microprocessor is working and is ready for use.

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

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