What is HGC?

Video Graphics Specifications
Creator :	Hercules Computer Technology, Inc.
Year Introduced :	1982
Video Standard :	HGC - Hercules Graphics Card
Horizontal Frequency :	18.4 Hz
Vertical Frequency :	50 Hz
Video RAM :	64K
Maximum Colors :	1
Maximum Resolution :	720x348
Starting Address :	B0000
Connector Type :	DB9
Video Signals :	2 TTL
Status :	Obsolete

Hercules Graphics Card

     A graphics display system for PCs developed by Van Suwannukul, founder of Hercules Computer Technology. Suwannukul developed the system so that he could produce his doctoral thesis on PC equipment using his native Thai alphabet.
     First offered in 1982, the original Hercules system filled a void left by IBM's MDA ( monochrome display adapter ) system. MDA produces high-resolution monochrome text but cannot generate graphics. Hercules systems generate both high-resolution text and graphics for monochrome monitors. The resolution is 720 by 348.
     Hercules has been supplanted by other standards, such as VGA, and is now obsolete.

DB-9 pins for HGC
Pin	Description
1	Signal ground
2	Signal ground
3	Not used
4	Not used
5	Not used
6	Signal intensity
7	Video signal
8	Horizontal sync
9	Vertical sync

C A U T I O N

Never run your monitor out of spec. If your display is screwed up, there's a good chance that the frequencies are out, so turn off the monitor!

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