alt Hacker NewsI had a herc clone on the 286 machine I bought around 1987 and later added a Super VGA card. One cool thing about the IBM PC was that the monochrome and color graphic systems were sufficiently different in terms of memory map and ports so you could plug in two graphics cards and two monitors and that's what I had.
I think this was true for MDA (text only), but the Hercules had 64k of video memory at B0000, the latter half of which would overlap with the CGA card, and also VGA's text mode.