
G L O S S A R Y
| Glossary |
UV | UltraViolet |
UVGA | Ultra Video Graphics Array. An improved VGA monitor standard |
| that provides at least 256 simultaneous colors and a screen |
| resolution of 1024 x 768 pixels. |
Vertical Blanking Interval (VBI) | |
| The time it takes the beam to fly back to the top of the screen in order |
| to retrace the opposite field (odd or even). VBI is in the order of 20 |
| TV lines. Teletext information is transmitted over 4 of these lines |
| (lines |
VESA (bus) | Video Electronics Standards Association (or VL bus). An internal |
| interconnect standard for transferring video information to a |
| computer display system. |
VGA | Video Graphics Array (IBM). The third and most common monitor |
| standard used today. It provides up to 256 simultaneous colors and |
| a screen resolution of 640 x 480 pixels. |
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. |
Computer Group Literature Center Web Site |