5150/5151 Video Card??

Alexandre Souza alexandre.tabajara at gmail.com
Mon Aug 15 00:07:41 CDT 2016

This is a CGA clone. It can work with CGA and Hercules monitors/modes, and
usually were switched by a program called MONO.COM.
I Believe I have some boards like that. Possibly I have the manual and

2016-08-15 1:53 GMT-03:00 Chuck Guzis <cclist at sydex.com>:

> On 08/14/2016 09:21 PM, Fred Cisin wrote:
> > That one has a lightpen connector, which his dorsn't. Not usually
> > important, but it might have other differences, such as different
> > functions for the switchrs.
> Take another look--the one in the photo has the header in the same place
> as that in the cited drawing.
> Taiwanese makers were extremely, er, incestuous, back in the day.
> The other telling thing is that there's no crystal/XCO on the board.
> CGA cards, generally don't have one--they take their timebase from the
> 14.318 MHz ISA bus signal.  MDA/MGA cards all have their own timebase
> (crystal/XCO).  EGA cards may have several.
> --Chuck

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