Microprocessor
The forms of IF statements in FORTRAN 77 are called

Logical IF and Block IF
Logical IF, block IF and arithmetic IF
Logic IF, block IF, arithmetic IF and negate IF
Logical IF and arithmetic IF

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Microprocessor
The interrupt facility is provided in microprocessor to

 stop the microprocessor when desired
 change the sequence of the instructions being executed
 stop the microprocessor when it starts malfunctioning
 keep a control on the working of the microprocessor

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Microprocessor
Cycle stealing mode of DMA operation involves

 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
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device

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