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48 PCM-3420 User's Manual
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I/O
Refers to an operations, program, or device whose purpose is to
enter data into or to extract data from a computer.
IRQ
Interrupt Request Channel. The IRQ of a host adapter can be
changed to several different settings by changing jumpers and/or
switch settings on the adapter board.
ISA
Industry Standard Architecture expansion bus. A type of
computer bus used in most PC’s. ISA enables expansion devices
like network cards, video adapters and modems to send data to
and receive data from the PC’s CPU and memory 16 bits at a time.
Expansion devices are plugged into sockets in the PC’s mother-
board. ISA is sometimes called the AT Bus, because it was
originally introduced with the IBM PC-AT in 1983. (PC/104
follows this standard.)
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