Microprocessor
Which of the following pair of gates can form a latch?

A cross coupled NAND/OR
A pair of cross copled AND
A pair of cross coupled OR
A pair of cross coupled NAND

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Microprocessor
A high on RESET OUT signifies that

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

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Microprocessor
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

 Devices have 8-bit address line
 There can be maximum of 256 input devices and 256 output devices
 Arithmetic and logic operations can be directly performed with the I/O data
 Devices are accessed using IN and OUT instructions

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Microprocessor
Program counter in a digital computer

 Counts the numbers of programs run in the machine.
 Counts the number of times the loops are executed.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times a subroutine is called.

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