Microprocessor
During which T-state, contents of OP code from memory are loaded into IR (Instruction Register)?

 T2 OP code fetch
 T1 OP code fetch
 T3 OP code fetch
 T4 OP code fetch

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Microprocessor
Cycle stealing mode of DMA operation involves

 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
 Data transfer takes place between the I/O device and memory during every alternate clock cycle

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of register B & C to be copied in the stack
 registers B & C to be cleared
 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

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