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Microprocessor

Microprocessor
What is the size (in bytes) of Prefetch queue in 8086?

 4.
 3.
 6.
 2.

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 1000H, PUSH B instruction will transfer the contents of registers B & C respectively for memory locations

 0FFF H and 0FFE H
 0FFE H and 0FFF H
 1000 H and 1001 H
 1000 H and 0FFF H

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Microprocessor
If m is a power of 2, the number of select lines required for an m-input mux is:

log2 (m)
2^m
m
2*m

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Microprocessor
The operations executed by two or more control units are referred as

 Bi control-operations
 Micro-operations
 Macro-operations
 Multi-operations

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Microprocessor
The microprocessor issues ALE during first T-state of

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

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Microprocessor
Identify the communication interfacing device from the following

 8255
 8155
 8257
 8251

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