Appendix D: Glossary of Terms
Manual Number: 41209-003-2
Page D-3
RAM (Random Access Memory):
The memory used to execute applications while your computer is turned ON. When you turn your
computer OFF, all data stored in RAM is lost.
Real-Time Clock (RTC):
A CMOS counter used to maintain local time.
Retaining Bracket:
The bracket on the end of the board that attaches to the back of the chassis and contains connectors,
usually keyboard, mouse, serial port, and/or parallel port.
Serial Port:
A two channel port, one channel used for In transmissions and one for Out transmissions.
SCSI (Small Computer System Interface):
A high speed, general purpose interface to storage devices.
SRAM (Static Random Access Memory):
As opposed to DRAM, this memory does not need to be refreshed by a controller and holds its
information as long as the power is on.
Tag Comparator:
A memory that tells whether an address is available in the cache.
Wait State:
Extra time inserted to allow access to slower devices (e.g. DRAM) or EPROMs.
Write-Back Cache:
The process where the CPU updates the cache and the DRAM simultaneously but does not wait for
the DRAM to complete the update.
Write-Thru Cache:
The process where the CPU updates the cache and DRAM simultaneously but the CPU waits for
the DRAM to complete the update, resulting in more time being consumed than in write-back.
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