This is Macrotech's best known board. It represented the best of the 8 bit
world (Z80) and the (then) 16 bit world (80286) all on one very dense 4 (or
6) layer board.
The board featured a Z80H which could run at 2 or 8 MHZ and a 80286 which
ran at 8 MHZ. The board also had a 80287 math co-processor. The
board was completely IEEE-696 compatible. There is a good write-up comparing
this board and the CompuPro 8086/87 board in the S-100 Journal
(vol1,#5,1987), see
here.
Unfortunately there may have been some
issues with the reliability of later boards, though I have not seen this
confirmed. There was another more detailed write-up of the board by Charles
Storm in the July 1985 issue of the Micro/Systems Journal (Vol 1, #3,p48).
It can be obtained
here.
The manual for this board can be obtained
here, the schematic for this board can be obtained
here.
Unfortunately you will see the board utilized 4 PALS without their
equations. This makes the board debugging/repairing difficult.
