Rockwell Automation 6180 Industrial Computers - Manual (Page 185)

Glossary D–3
Publication 6180-6.0
SIMM
Acronym for Single In Line Memory Module. These memory chips add
RAM to a computer. The most popular format is the 72-pin SIMM
which holds from I to 64 Mbytes. SIMMs are available in different
speeds, with typical response times of 50 to 80 nano seconds.
SVGA
Acronym for Super Video Graphics Array. An extension of the VGA
video standard. SVGA enables video adapters to support resolutions of
800 x 600 pixels and higher with up to 16.7 million colors.
USB
The Universal Serial Bus (USB) is a new external bus standard that
supports data transfer rates of 12Mbps (12 million bits per second). A
single USB port can be used to connect up to 127 peripheral devices,
such as mice, modems, and keyboards. USB also supports Plug-and-
Play installation and hot plugging.
Starting in 1996, a few computer manufacturers started including USB
support in their new machines. It is expected to be commonplace and to
eventually replace serial and parallel ports completely.
XGA
Acronym for Extended Graphics Array. This video standard was
introduced in 1990 to replace the older 8515/A video standard. It
provides the same resolutions (640 by 480 or 1024 by 768 pixels), but
supports more simultaneous colors (65,000 vs the 8514/A's 256). In
addition, XGA allows monitors to be non-interlaced.