Okay, I've
got the schematics for the Explorer 88/PC (Netronics R&D, New
LItchfield, Conn), which uses an 8250 for async, has a separate keyboard
and cassette interface. No video as far as I can tell.
Would you consider sharing these with your down trodden brothers in the community
who've had to go without?
Google Is Your Friend. Look at the ad on page 4 of this PDF:
Netronics marketed a variety of kits--the original Explorer, which I
believe was a Z80 box, the Explorer 85, which was an 8085 box and the
Explorer 88/PC. Looking at the prices is somewhat germane to the
original topic. Can you imagine spending $250 for a floppy controller
card or $300 for a keyboard?
Marcus has some "Blue Seed" stuff on his site: