DEC 4000 AXP Service Manual page 220

Factory Installed Software (FIS)
Operating system software that is loaded into a system disk during manufacture.
On site, the FIS is bootstrapped in the system, prompting a predefined menu of
questions on the final configuration.
fast SCSI
An optional mode of SCSI-2 that allows transmission rates of up to 10 MB/s. See
also SCSI.
FDDI
Fiber Distributed Data Interface. A high-speed networking technology that uses
fiber optics as the transmissions medium.
FEPROM
Flash-erasable programmable read-only memory. FEPROMs can be bank- or
bulk-erased. Contrast with EEPROM.
FIS
See Factory Installed Software.
firmware
Software code stored in hardware.
fixed-media compartments
Compartments that house nonremovable storage media.
front end unit (FEU)
One of four modules in the DEC 4000 AXP system power supply. The FEU
converts alternating current from a wall plug to 48 VDC that the rest of the
power subsystem can use and convert.
FRU
Field-replaceable unit. Any system component that the service engineer is able to
replace on-site.
full-height device
Standard form factor for 5 1/4-inch storage devices.
Futurebus+
A computer bus architecture that provides performance scalable over both time
and cost. It is the IEEE 896 open standard.
Glossary–10