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Microprocessor

Microprocessor
The minimum number of transistors required to implement a two input AND gate is

6
4
2
8

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

 320ns
 960ns
 1280ns
 640ns

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Microprocessor
After RESET 8255 will be in

 mode 2
 mode 0; all ports are input
 unchanged condition
 mode 0; all ports are output

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Microprocessor
In order to complement the lower nibble of accumulator one can use

 ORI 0FH
 CMA
 XRI 0FH
 ANI 0FH

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Microprocessor
How many bytes in a zero memory page should be reserved for vectors used by RST instructions?

 128.
 16.
 32.
 64.

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