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50 PCM-3420 User's Manual
PORT I/O ADDRESS
A window through which software programs communicate
commands to an installed host adapter board. The commands are
communicated 8 bits at a time.
PROGRAMMED INPUT/OUTPUT
A method of data transfer in which the host microprocessor
transfers data to and from memory via the computer’s I/O ports.
PIO enables very fast data transfer rates, especially in single-
tasking operating systems like DOS. The Adaptec AHA-1510 and
AHA-1520 host adapters and the AIC-6260 SCSI protocol
controller use this data transfer method.
Q
R
REMOVABILITY
A feature where the media in a removable media disk drive can be
removed, then replaced with the same or different media without
causing problems to the operating system. If removability was not
supported, media in a removable media drive could not be
removed without potential loss for data unless the computer was
turned off.