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Microprocessor

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

 8253
 8259
 8279
 8251

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

 320ns
 1280ns
 960ns
 640ns

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Microprocessor
The number of output pins in 8085 microprocessors are

 19.
 27.
 21.
 40.

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Microprocessor
In a computer the data transfer between hard disk and CPU is nearly the same as that between diskette and CPU.

True
False

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Microprocessor
Which one of the following statement is false?

 A microprocessor has bi-directional address bus
 A microprocessor has an ALU
 A microprocessor has unidirectional address bus
 A microprocessor has bi-directional data bus

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Microprocessor
Which general register or general register pair is incremented/decremented by 2 during PUSH and POP instructions?

 Program Counter.
 D-E.
 Stack Pointer.
 H-L.

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