Peripheral Adapter and Its Operations

Peripheral Adapter  : Modern computers perform operations very much faster than most peripherals can generate or accept data. Programs and data are moved between memory and the CPU at such a speed that it would be inappropriate to connect peripherals directly to the CPU. So some form of interface (Peripheral Adapter) is required to convert between the fast internal communications and the relatively slow external devices.

Operations  of Peripheral Adapter :

The CPU performs arithmetic and logic operations and

controls the operation of the entire system.

1. Some tasks are completely controlled by CPU, but for some

others, it merely initiates a sequence of events which are

controlled elsewhere, such as in a peripheral device.

2. The peripheral devices permit communication of

information and storage of information.

3. Peripherals normally communicate through the CPU.

4. Some may communicate themselves and memory bypassing

CPU

5. The number and types of peripheral devices depend on the

main applications for which the computer system is

intended.