Sun Microsystems SPARCstation 20 Service Manual page 255

MACIO
MBus module
Mbyte
MDI
MMU
Monitor 1)
Monitor 2)
MSBI
NVRAM
NVSIMM
on-board diagnostics
Pok
POST
printed circuit board
PROM
RAM
RH
ROM
SBus card
SCC
SBus-to-SCSI, Ethernet, and parallel interface. An ASIC that integrates three
functions: DMA, LANCE, and fast SCSI bus interface. Provides the interface
between the SBus and the following: SCSI, thick AUI Ethernet, TPE, and
parallel port.
A printed circuit board installed in an MBus slot of the system unit that
contains the CPU circuitry and components.
Megabyte.
Memory display interface.
Memory management unit.
Indicated by the > prompt. From the > prompt, you can boot the system,
continue the execution of a halted program, or enter the Forth Toolkit. If
disaster happened to your operating system, the Monitor automatically starts.
A video display unit that is part of the SPARCstation 20 system. It is not the
same as a terminal.
MBus-to-SBus interface.
Non-volatile RAM.
Non-volatile single in-line memory module.
Tests that allow you to test the network controller, diskette drive system,
memory, cache, system clock, and watch the network for valid Ethernet data
packets.
Power ok. A signal from the power supply that is activated after DC voltages
are nominal.
Power-on self-test. Executes when you turn on the system power switch or
reboot the system and press and hold the keyboard Stop (L1) and D keys.
Initiated from the OpenBoot PROM, POST is a series of rudimentary tests
designed to verify that the major components on the system board and the
MBus modules installed within the system are operating properly.
Any board with electronic wiring etched on it.
Programmable read-only memory.
Random access memory.
Relative humidity.
Read-only memory.
A printed circuit board installed in an SBus slot of the system unit.
Serial communications controller.
Glossary 231