Input/Output

______ is the interface to one or more peripheral devices by tailored data links.

• Processor

• Memory module

• I/O module

• System bus

Why peripherals are not connected to the system bus directly?

• Peripherals use different data formats and data lengths

• Data transfer rate in devices are much slower

• Peripherals have different ways of operations

• All of the above

Printer is an example of which category of external devices?

• Human readable

• Information

• Machine readable

• Communication

READY/NOT-READY to show whether the device is ready for data transfer is indicated by _______.

• data bits

• control signals

• status signals

• buffer

Which device converts data from electrical to other forms of energy during output?

• Control logic

• Buffer

• Peripheral

• Transducer

Paper jam reported by the printer is handled by which function of the I/O module?

• Device communication

• Error detection

• Control and timing

• Processor communication

Which I/O module function temporarily stores data to balance device and memory speeds?

• Device communication

• Data buffering

• Control of data transfer

• Processor communication

The processor uses the _____ to issue commands to the I/O module.

• control lines

• data lines

• address lines

• status lines

Which I/O command transmits data item from the data bus to the peripheral?

• Test

• Control

• Write

• Read

A(n) _____ allows an I/O device to send/receive data directly to/from memory, bypassing CPU.

• external device control logic

• DMA controller

• disk controller

• I/O logic