AT&T 3B2 Off-Line Diagnostic Manual page 721

----------------------------------------------------------------------------Glossary
firDnlVare state
The operating state of the 3B2 computer that allows you to make a floppy key, run diagnostics,
change the firmware password, dump the system image to a floppy disk or hard disk, test hardware
and firmware, and display the system generic version.
floppy disk
A flat, flexible disk on which programs and data can be stored.
floppy disk drive
A device that allows your 3B2 computer to read and write information to and from floppy disks.
hard disk (drive)
A device used to store large amounts of data in a short amount of time.
hardlVare
The physical components of a computer.
initialize
See "boot."
ISC feature
Intelligent Serial Controller - A feature card and associated hardware that allows the 3B2 computer
to communicate in a synchronous environment.
K or Kilobyte
Abbreviations for the number 1024. The "K" comes from kilo, meaning one thousand. Therefore,
one Kilobyte equals 1024 bytes. A full 81/2- by II-inch page contains about 2000 characters or 2
Kbytes of data.
local area netlVork
A means of connecting computers that reside in the same room, building, or group of buildings which
allows individual nodes (computers) to share resources.
login
A string of letters and/or numbers that lets the 3B2 computer know with whom it is communicating.
M or Megabyte
Abbreviations for million. One Mbyte or megabyte is 2
20
(1,048,576) bytes when you are considering
Random Access Memory. However, it is 10
6
bytes when you are considering SCSI hard disks.
MAU
Math Accelerator Unit - A chip that provides IEEE standard floating point support for the
microprocessor.
MMU
Memory Management Unit - A chip that provides support for running the paging scheme of memory
management. The chip makes use of tables maintained by the kernel for performing address
translations.
DnodeDn
A device used to transmit digital data over voice telephone lines. (The word "modem" derives from
MODulate and DEModulate.)
Dnodular connector
Modular telephone jacks or plugs. The 4-pin modular connectors are used for telephone connections,
and 8-pin modular connectors are used for data connections.
MPE feature
Multiprocessor Enhancement - A feature card [referred to as Multiprocessor Enhancement (MPE)
card and Multiprocessor Board (MPB)] and associated software that off-loads user processes from the
primary processor to improve the performance of the system.
GLOSSARY G-3