This card is made by Colorgraphic Communications in 1988, and has two VGA ports, and works well with a 80486 computer.
I tried to used that with IBM 5150 and other XT clones, but I failed. According to my guess, the reason for the failure is the wrong jumper setting of the card. So I've tried a few cases, but I've failed again. There is no information about this card on the Internet.
What is known about this card?