Input Output Modes of Transfer

Status of a IO device is checked by CPU in which mode of transfer?

• Interrupt IO

• Programmed IO

• DMA

• All of the above

When CPU invokes a subroutine it performs following functions:

• Pushes updated PC content(return address) on stack

• Loads PC with starting address of subroutine

• Loads PC with starting address of ALU

• Both 1 and 2

Which technique is used that identifies the highest priority resource by means of software.

• Daisy chaining

• Polling

• Priority

• Chaining

Two ways in which computer buses can communicate with memory in case of I/O devices by using:

• Separate buses for memory and I/O device

• Common bus for memory and I/O device

• Both 1 and 2

• none of these

Advantages of isolated I/O are:

• Commonly usable

• Small number of I/O instructions

• Both 1 and 2

• None of these

Same control lines for both memory and I/O devices in:

• Memory mapped IO

• Isolated I/O

• Separate I/O

• Optimum I/O

Who determine the address of I/O interface.

• Register select

• Chip select

• Both 1 and 2

• None of these

________is a single control line that informs destination unit that a valid data is available on the bus:

• Strobe

• Handshaking

• Synchronous

• Asynchronous

In_______ technique has 1 or more control signal for acknowledgement that is used for intimation:

• Handshaking

• Strobe

• Both 1 & 2

• None of these

Which technique helps processor to run a program concurrently with I/O operations:

• Interrupt driven IO

• DMA

• IOP

• DCP