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Glossary of Terms and Abbreviations A-7
STA SCSI Trade Association. A group of companies that cooperate to
promote SCSI parallel interface technology as a viable mainstream I/O
interconnect for commercial computing.
Synchronous
Data Transfer
One of the ways data is transferred over the SCSI bus. Transfers are
clocked with fixed frequency pulses. This is faster than asynchronous
data transfer. Synchronous data transfers are negotiated between the
SCSI host adapter and each SCSI device.
System BIOS Controls the low-level POST (power-on self-test), and basic operation of
the CPU and computer system.
Ultra SCSI A standard for SCSI data transfers. It allows a transfer rate of up to
20 Mbytes/s over an 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit
SCSI bus. SCSI Trade Association (STA) supports using the term “Ultra
SCSI”overtheolderterm“Fast-20”.
Ultra2 SCSI A standard for SCSI data transfers. It allows a transfer rate of up to
40 Mbytes/s over an 8-bit SCSI bus, and up to 80 Mbytes/s over a
16-bit SCSI bus. SCSI Trade Association (STA) supports using the term
“Ultra2 SCSI” over the term “Fast-40”.
Ultra160 SCSI A standard for SCSI data transfers. It allows a transfer rate of up to
160 Mbytes/s over a 16-bit SCSI bus.
VCCI Voluntary Control Council for Interference.
VDE Verband Deucher Elektroniker (Association of German Electrical
Engineers).
Virtual Memory Space on a hard disk that can be used as if it were RAM.
Wide SCSI A SCSI-2 feature allowing 16-bit or 32-bit transfers on the SCSI bus. This
dramatically increases the transfer rate over the standard 8-bit SCSI bus.
Wide Ultra SCSI The SCSI Trade Association (STA) term for SCSI bus width 16-bits, SCSI
bus speed maximum data rate 40 Mbytes/s.
Wide Ultra2
SCSI
The SCSI Trade Association (STA) term for SCSI bus width 16-bits, SCSI
bus speed maximum data rate 80 Mbytes/s.
Wide Ultra160
SCSI
The SCSI Trade Association (STA) term for SCSI bus width 16-bits, SCSI
bus speed maximum data rate 160 Mbytes/s.
Word A two byte (or 16-bit) unit of information.