22. _________ is a single control line that informs destination unit that a valid is available on the bus ?
23. Which technique has one or more control signal for acknowledgment that is used for intimation ?
24. A keyboard has which type of asynchronous transfer mode ?
25. Which technique helps processor to run a program concurrently with input output operations ?
C.Interrupt driven I/O
26. Which exception is also known software interrupt ?
D.All of above
27. User programs interact with I/O devices through ?
28. Which table handle store address of interrupt handling subroutine ?
B.Symbol link table
C.Interrupt vector table
D.None of above
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