5150/5151 Video Card??

[Alexandre Souza]

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
disk.

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
>