Boca SuperX SVGA25, Installation Manual

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EGA . Enhanced Graphics Adapter. High resolution IBM graphics
standard capable of displaying 640 x 350 pixels in 16 colors out of a
palette of 64 colors.
EGA Monitor . Any monitor capable of displaying both EGA and CGA
standard modes. This includes ECD and multiple frequency monitors.
Extended EGA . Offered by proprietary chip sets on non-IBM
adapter cards with 640 x 480 resolution or better.
Feature Connector.
Used by graphics adapters to give compatibility
with VGA text and graphics codes for use with multi-media
applications.
GUI. Graphical User Interface.
Flicker . The wavering or unsteady image on some monitors. A major
cause can be a low refresh rate.
Hardware Graphics Cursor. Provides a faster method of displaying/
moving a cursor (GUI arrow) on the screen. The video adapter’s main
chipset controls this function which resides in system memory, as
opposed to slower handling by the application software.
HGC . Hercules Graphics Card. Compatible with MDA, but also capable
of displaying 720 x 348 pixels in a 4-bank graphics mode.
Hi-res . Short for High Resolution, this term should be only applied to a
minimum of 640 x 350 resolution and above.
Horizontal Scan Rate . The frequency in KHz (kilohertz) at which
the monitor is scanned in a horizontal direction; high horizontal
scan rates produce higher resolution. The EGA horizontal scan rate is
21.8 KHz, while the extended EGA horizontal scan rate is 30.1 KHz.
Interlaced. A method of scanning a screen which results in alternate
lines being drawn with each full pass of the electron beam. The
resulting display is less stable than a flicker-free non-interlaced display.