Sun Microsystems SPARCstation 4, Service Manual

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Glossary-3
On-Board
Diagnostics A test that allows you to test the control registers, the network controller,
the diskette drive system, memory, the cache, the system clock, and watch the
network for valid packets.
Pok Power ok. A signal from the power supply that is activated after DC voltages
have risen.
POST Power-On Self-Test. The POST runs when you turn on the system power
switch or reboot the system and press and hold the L1-d keys. The POST,
stored in the boot PROM, is a series of rudimentary tests designed to verify
that the major components on the system board are working properly.
printed circuit board Any board with electronic wiring etched on it.
PROM Programmable read only memory.
RAM Random access memory.
ROM Read only memory.
SBus card A printed circuit board installed in an SBus slot of the system unit.
SCC Serial communications controller.
SCSI Small computer system interface; pronounced “scuzzy.”
SIA Serial interface adapter.
SIMM Single in-line memory module.
SunDiag System
Exerciser Diagnostic software that runs under SunOS system software; displays real-time
use of system resources and peripheral equipment such as Desktop Storage
Packs and External Storage Modules.
system Monitor See Monitor (1) or (2).
terminal A video display device and keyboard that is used to type and display
information. A terminal may be connected to either of the serial interface ports
on the back panel of the SPARCstation 4 system. It is not the same thing as a
monitor.
TOD Time-of-Day clock.
TPE Twisted-pair Ethernet.
UART Universal asynchronous receiver/transmitter.
VRAM Video RAM.
VSIMM VRAM single in-line memory module.