Instruction manual

REX
ROM executive.
ROM
Read-only memory.
RTC
The system’s real-time clock. It provides a system clock, battery-backed-up
time-of-year clock, and battery-backed-up nonvolatile RAM (NVR) for use as
system startup configuration parameters.
SBCDBB
Single-bit correction, double bit detection.
SCC
Serial communications controller
SCSI
Small computer system interface. An ANSI-standard interface for connecting
disks and other peripheral devices to computer systems.
SFB
Smart frame buffer logic, residing in a dedicated ASIC, controls the graphics
subsystem of 300 and 500 models.
SROM
Serial read-only memory.
TCDS
The dual SCSI interface chip (TCDS), connected to the TURBOchannel. A SCSI
controller chip that interfaces to the TCDS ASIC provides a single-ended, 8-bit, 5
MB/s SCSI port.
Thickwire
An IEEE standard 802.3-compliant Ethernet network made of standard Ethernet
cable.
UART
Universal asynchronous receiver/transmitter.
Victim
Used in reference to a cache block in the cache of a system bus node. The cache
block is valid but is about to be replaced because of a resource conflict in a cache
block.
Write-back
A cache management technique in which data from a write operation to cache
is written into main memory only when the data in cache must be overwritten.
This can result in inconsistencies between cache and main memory.
Glossary–4