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Microprocessor

Microprocessor
________is the only non-vectored interrupt in 8085 microprocessor.

 RST 5.5
 TRAP
 INTR
 RST 7

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Microprocessor
XCHG instruction exchanges the content of H-L with ______ register pair.

 D-E
 Stack Pointer
 B-C
 PSW

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Microprocessor
The microprocessor issues ALE during first T-state of

 memory READ cycle only
 fetch cycle only
 every machine cycle
 memory WRITE cycle only

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Microprocessor
The 8085 microprocessor enters into bus idle machine cycle whenever

 RST 7.5 is recognized
None of these
 DAD RP instruction is executed
 INTR interrupt is recognized

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Microprocessor
Which of the following instruction will never affect the zero flag?

 DCX Rp
 XRA R
 ORA R
 DCR R

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Microprocessor
Which one of the following ICs is used to interface keyboard and display?

 8253
 8251
 8259
 8279

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