Microprocessor
The microprocessor may be made to exit from HALT state by asserting

 A or B or HOLD line
 READY line
 RESTART
 any of the five interrupt lines

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

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