14 Aug
2016
14 Aug
'16
10:07 p.m.
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