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Microprocessor

Microprocessor
DMA signal/signals in 8085 is/are

 HLDA.
 HOLD.
 All.
 READY.

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Microprocessor
Maximum of how many devices can be connected simultaneously to the microprocessor via 8257 in DMA data transfer mode?

 8
 10
 4
 6

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Microprocessor
Which one of the following statement is false?

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

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Microprocessor
The addressing mode in instruction PUSH B is

 direct
 register indirect
 immediate
 register

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Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 01000000
 11000100
 010001000
 00000100

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Microprocessor
Total number of modes the 8253 can work

 12
 8
 4
 6

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