The AST cards were part of Apple's bid for corporate acceptance, along with Tokenring networking and parity RAM. Phoenix Technologies as well as Apple had a hand in the card's design according to contemporary reports. Sadly I don't have much technical data on the cards. Can anyone tell me whether they used an 8088 or 8086 processor? How was RAM provided?
There were actually two cards- a Mac86 which was an SE expansion board and the Mac286 which was Nubus. I've never seen a Mac86 in the wild, but the Mac286 was basically a single (er, two) board computer which interfaced to the Mac and had its own memory. 1MB was the normal memory on a Mac286, though the later version could max at 4MB.
That is a little odd, because I know that the unit received pretty widespread coverage in computer magazines at the time. Shouldn't be that difficult to find contemporary documentary evidence.
As I said, I have all the doc (and MSDOS disks) but not the card. I should get a hold of the guy I got them from to see if he might have the card kicking around.
According to the Mac86 user's manual, it requires a MacSE with System 6.0 and 1MB RAM (2MB for multifinder). It uses an 8086 processor and an external PC floppy drive is recommended. It shares the Mac OS clipboard and printers. No mention of on-board RAM.