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 <ccl...@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 >
