Adaptec PC/104 - Manual (Page 55)

Appendix C Glossary of Terms 49
L
M
N
Narrow SCSI device (as opposed to Wide SCSI device)
This is the term attributed to today’s 8 bit standard SCSI devices.
This term is necessary to distinguish today’s 8-bit SCSI devices
to 16-bit Wide SCSI devices.
O
P
PIO (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.