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Read-Only
Memory (ROM)
Memory from which information can be read but not changed. The contents of ROM are not
erased when the computer is turned off.
Reduced
Instruction Set
Computer (RISC)
core
The HP A7173A adapter’s SCSI chips contain a RISC processor.
S
SCSI bus A host bus adapter and one or more SCSI peripherals connected by cables in a linear chain
configuration. The host bus adapter can exist anywhere on the chain, allowing connection of
both internal and external SCSI devices.
SCSI device Any device conforming to the SCSI standard that attaches to the SCSI bus by means of a SCSI
cable. This includes SCSI host bus adapters and SCSI peripherals.
SCSI ID A unique identification for each SCSI device on the SCSI bus. Each SCSI bus has fifteen available
SCSI IDs numbered 0 through 15 for Wide SCSI or 0-7 for 8-bit SCSI. The host bus adapter is
usually assigned ID 7, which gives it priority to control the bus.
SCSI-3 The current SCSI specification that defines the command formats used in the SCSI protocol.
SE See Single-Ended.
Single-Ended A hardware specification for connecting SCSI devices. It references each SCSI signal to a common
ground, as opposed to differential SCSI and low-voltage differential SCSI, which use a separate
return for each signal.
small computer
system interface
(SCSI)
A specification for a high-performance peripheral bus and command set. The original standard
is now referred to as SCSI-1.
SPI-4 The SCSI Parallel Interface Specification for ultra320 SCSI componenets.
synchronous data
transfer
One of the ways data is transferred over the SCSI bus. Transfers are clocked with fixed-frequency
pulses.
system firmware Controls the low level POST (Power On Self Test) and basic operation of the CPU and computer
system.
T
termination The electrical connection required at each end of the SCSI bus, composed of a set of resistors.
U
Ultra SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 20 MBytes/sec over an 8-bit
SCSI bus, and up to 40 MBytes/sec over a 16-bit SCSI bus. The STA (SCSI Trade Association)
supports using the term “Ultra SCSI” over the older term “Fast-20.”
Ultra160 SCSI (Also called Ultra3 SCSI) A standard for SCSI data transfers. It allows a data transfer rate of up
to 160 MBytes/second over a 16-bit SCSI bus. The bus width is always 16 bits.
Ultra2 SCSI A standard for SCSI data transfers. It allows a transfer rate of up to 40 MBytes/sec over an 8-bit
SCSI bus, and up to 80 MBytes/sec over a 16-bit SCSI bus. The STA (SCSI Trade Association)
supports using the term “Ultra2 SCSI” over the older term “Fast-40.”
Ultra320 SCSI A standard for SCSI data transfers. It allows a data transfer rate of up to 320 MBytes/second
over a 16-bit SCSI bus. The bus width is always 16 bits.
V
VCCI Voluntary Control Council for Interference.
VHDCI Very High Density Cable Interconnect.
80 Glossary