Glossary
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virtual address
A binary address issued by a CPU that indirectly refers to the
location of information in primary memory, such as main
memory. When data is copied from disk to main memory, the
physical address is changed to the virtual address.
VL bus
See VESA Local bus (VL bus).
VMEchip2
MCG second generation VMEbus interface ASIC (Motorola)
VME2PCI
MCG ASIC that interfaces between the PCI bus and the
VMEchip2 device.
volatile memory
A memory in which the data content is lost when the power supply
is disconnected.
VRAM
Video (Dynamic) Random Access Memory. Memory chips with
two ports, one used for random accesses and the other capable of
serial accesses. Once the serial port has been initialized (with a
transfer cycle), it can operate independently of the random port.
This frees the random port for CPU accesses. The result of adding
the serial port is a significantly reduced amount of interference
from screen refresh. VRAMs cost more per bit than DRAMs.
Windows NT™
The trademark representing Windows New Technology, a
computer operating system developed by the Microsoft
Corporation.
XGA
EXtended Graphics Array. An improved IBM VGA monitor
standard that provides at least 256 simultaneous colors and a
screen resolution of 1024 x 768 pixels.
Y Signal
Luminance. This determines the brightness of each spot (pixel) on
a CRT screen either color or B/W systems, but not the color.
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