An adapter board is a printed circuit board that plugs into an expansion bus slot to provide added capabilities.
The common adapters for the microcomputer include display adapters, memory expansion adapters, input/output adapters, and adapters for other devices such as internal modems, CD-ROMs, or network interface cards.
One adapter can often support different devices. For example, an input/output adapter may support one parallel port, a game or joystick port, and several serial ports.
Some microcomputers incorporate many of the functions previously performed by individual adapters on the motherboard.
Multi – I/O port Adapter Board
This board supports a number of peripheral interface adapters. Typically all the device adapters and ports on the multi-O/O chip.
The adapter function s which may be included in the Multi-I/O board are floppy disk drive adapter and port, the IDE adapter and port for the hard disk drive, two serial communication (COM) ports for RS 232C or standard asynchronous transfer protocols, game controller adapter and port, parallel printer adapter and port, etc.
There have been several enhancements in the IDE interface that supports more than two drives and a significant increase in interface data transfer performance.
These enhancements are part of an improved IDE specification called EIDE (Enhanced IDE). It is possible to attach CD-ROM drives to the EIDE port.
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