Microprocessor
In microprocessor based system I/O ports are used to interface

 the I/P device only
 all the I/O devices
 the I/O devices and memory chips
 the O/P devices only

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of register B & C to be copied in the stack
 the contents of register B only to be copied in the stack
 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 registers B & C to be cleared

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