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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.
MDA. Monochrome Display Adapter. Early IBM
Video display board designed for use with IBM
monochrome text standard.
Monochrome Monitor. A TTL monitor which can
display only 2 colors (generally green/black or
amber/black).
Multiple Frequency Monitor. Monitor capable of
displaying video signals over a wide range of
horizontal scan frequencies. This may include a
horizontal capture range from 5.5KHz to 35KHz or
wider. Examples of monitors in this class are the
NEC MultiSync and the Sony Multiscan. The
Multiscan has a wide horizontal scan capture range
which enables it to display monochrome signals.
Palette. The range of colors from which you can
select the actual colors that the video adapter will
display simultaneously. Pixel. A single dot on the
CRT display. This word is derived from the words
‘picture’ and ‘element’.
