I recently purchased a PC-XT clone (manufactured and sold by THE - Thompson, Harriman, Edwards), and it arrived with a Hercules-compatible video card. I am delighted - this is an unexpected luxury - but I do not recognize the card and was hoping to look up any/all supporting documentation and/or software for it.
Do any of you good folks recognize this card?
Thanks!
Odd, I have a very similar card but mine has a color/ mono switch.
Might have to pull the label off the ic
Stranger is having a light pen header but no oscillator for CGA
rmay635703 wrote on 2023-06-14, 17:07:Stranger is having a light pen header but no oscillator for CGA
I thought the same when I saw the header.
When was this card made? After 1990?
If so, I suppose it dropped CGA simply because it was obsolete at the time.
I can't imagine anyone in the western hemisphere still using CGA by the time VGA was popular.
Hercules/MDA still had a reason to exist.
The graphics were hi-res and professional users still had a demand for them.
They also were used in tandem with VGA cards for debugging purposes (in MDA mode; CodeView, Turbo Debugger etc).
Edit: Found something. Hm. It seems that Hercules and light pens are no contradiction.
"Some Hercules cards support a light pen.
Bit 1 of port 3BAh returns the lightpen sensor status;
any write to port 3BBh resets the light pen status. "
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
//My video channel//
rmay635703 wrote on 2023-06-14, 17:07:Stranger is having a light pen header but no oscillator for CGA
CGA cards don't need an oscillator - the required frequency (14.31818 MHz) is provided by the ISA bus.
Nie tylko, jak widzicie, w tym trudność, że nie zdołacie wejść na moją górę, lecz i w tym, że ja do was cały zejść nie mogę, gdyż schodząc, gubię po drodze to, co miałem donieść.
