Computer I/O and DMA Quiz

DMA stands for:

• Direct Management Access

• Direct Memory Application Access

• Direct Memory Access

• Direct Mainboard Administration

Characteristics of multi-level centralized bus arbitration:

• Peripheral devices are connected to a single bus request line

• Devices are connected to the bus arbitration unit with a single wire

• Each peripheral device has a separate bus request line

• Peripheral devices are connected to different bus request lines

Which statement about programmed I/O is incorrect?

• The peripheral device is the active entity in data exchange

• The peripheral device is the passive entity in data exchange

• When executing a program with an I/O instruction, the CPU controls data exchange with the peripheral device

• Using I/O instructions in the program to exchange data with ports

An important feature of an asynchronous bus is:

• It has a common clock signal controlling operations

• Data is transmitted simultaneously

• It lacks a common clock signal controlling operations

• Data is transmitted asynchronously

Which statement about block DMA is correct?

• Data is transmitted whenever the bus is free

• Data is transferred in blocks, and DMA returns the bus to the CPU after the entire block is transferred

• The CPU is temporarily suspended during each bus cycle

• Data is transmitted discontinuously in bytes

How many methods are there to identify interrupt modules?

• 4 methods

• 1 method

• 3 methods

• 2 methods

Which statement about serial I/O is correct?

• Multiple bits are transmitted at once

• It is fast

• It requires multiple data transmission lines

• It requires a converter from parallel to serial data and vice versa

Which of the following components is part of a peripheral device?

• Signal converter

• Peripheral device status/control register

• Data buffer register

• I/O ports

The main components in an I/O system are:

• Data input devices and data output devices

• Peripheral devices and I/O modules

• Data conversion devices

• Data transmission devices

In which bus arbitration method are peripheral devices connected to different bus request lines?

• Multi-level centralized bus arbitration

• Single-level centralized bus arbitration

• Centralized bus arbitration

• Decentralized bus arbitration