Input-output organization

The data transfer rate of peripheral devices differ from each other.

Each peripheral behaves differently from any other.

The input-output organization of a computer is a function of the size of the computer and the devices connected to it.

Peripheral Devices

ASCII Alphanumeric Characters: I/O Devices that communicate with people and the computer are usually involved in the transfer of alphanumeric information to and from the device and the computer. The standard binary code for the alphanumeric characters is ASCII (American Standard Code for Information Interchange).

American Standard Code for Information Interchange

b7 b6 b5 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 b4 b3 b2 b1 0 0 0 0 0 0 0 1 0 0 1 0 . . . . . . . . . . . . 1 1 1 0 1 1 1 1

Peripheral Devices

PERIPHERAL DEVICES

Input Devices Output Devices Keyboard • Card Puncher, Paper Tape Puncher