MP & MC

Which one of the following is not a vectored interrupt?

• TRAP.

• INTR.

• RST 7.5.

• RST 3.

8085 microprocessor has how many pins

• 30

• 40

• 20

• 50

HLT opcode means

• load data to accumulator.

• end of program.

• load accumulator with contents of register.

• store result in memory.

In 8085 name/names of the 16 bit registers is/are

• stack pointer.

• program counter.

• both A and B.

• none of these.

What is SIM?

• Select interrupt mask.

• Sorting interrupt mask.

• Set interrupt mask.

• None of these.

Which one of the following circuits transmits two messages simultaneously in one direction

• Duplex

• Diplex

• Simplex

• Quadruplex

The number of output pins in 8085 microprocessors are

• 27

• 40

• 21

• 25

The processor status word of 8085 microprocessor has five flags namely:

• S, Z, AC, P, CY

• S, OV, AC, P, CY

• S, Z, OV, P, CY

• S, Z, AC, P, OV

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

• An op-code fetch cycle

• A memory read cycle

• A memory write cycle

• An I/O read cycle

The register which holds the information about the nature of results of arithmetic and logic operations is called as

• Accumulator

• Condition code register

• Flag register

• Process status register