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Microprocessor

Microprocessor
Identify the programmable DMA controller from the following

 8251
 8257
 8279
 8253

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

 DCR R
 XRA R
 DCX Rp
 ORA R

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Microprocessor
In microprocessor based system DMA refers to

 direct memory access for microprocessor
 direct memory access for the user
None of these
 direct memory access for the I/O device

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Microprocessor
The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is

 twice the desired frequency
 four times the desired frequency
 equal to the desired frequency
None of these

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Microprocessor
A 37 bit mantissa has an accuracy of

10 decimal places
6 decimal places
11 decimal places
8 decimal places

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

 An I/O read cycle
 A memory write cycle
 An op-code fetch cycle
 A memory read cycle

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