SCSI ID

A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI

 

bus has eight available SCSI IDs numbered 0 through 7 (or 0 through

 

15 for Wide SCSI). The host adapter usually gets the highest ID (7 or 15)

 

giving it priority to control the bus.

SDMS

Storage Device Management System. An LSI Logic software product that

 

manages SCSI system I/O.

Single-Ended

A hardware specification for connecting SCSI devices. It references each

SCSI

SCSI signal to a common ground. This is the most common method (as

 

opposed to differential SCSI which uses a separate ground for each

 

signal).

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 a 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit

 

SCSI bus. STA (SCSI Trade Association) supports using the term “Ultra

 

SCSI” over the term “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. STA (SCSI Trade Association) supports using the term

 

“Ultra2 SCSI” over the term “Fast-40”.

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.

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Glossary Terms and Abbreviations