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Microprocessor

Microprocessor
Identify the communication interfacing device from the following

 8155
 8255
 8251
 8257

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Microprocessor
The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is

 1280ns
 960ns
 320ns
 640ns

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Microprocessor
The length of bus cycle in 8086/8088 is four clock cycles, T1, T2, T3, T4 and an indeterminate number of wait state clock cycles denoted by Tw. The wait states are always inserted between

 T4 & T1
 T3 & T4
 T1 & T2
 T2 & T3

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Microprocessor
The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

 Memory cycle
 Clock cycle
 Machine cycle
 Instruction cycle

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

 8259
 8279
 8253
 8251

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Microprocessor
SUB A instruction in 8085

 reset carry and sign flags
 reset zero and parity flags
 sets zero and sign flags
 sets zero and carry flags

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