Date   : Thu, 24 Jan 1985 03:22:00-EST
From   : Jerry E. Pournelle <POURNE@Mit-Mc.ARPA>
Subject: macrotech board update...

fascinating.  One of the real difficulties is that there are
KNOWN bugs in the B-step revs of the 80286 chip; so many that
CompuPro refuses to sell a 286 board except for "development",
and warns users.  Macrotech and Gifford think they have fixed or
wired around all the problems, and perhaps they have, although
your strange experiences make one wonder.
       Dual processors were a great idea in their time.  After
some thought, though, I am converting my system to a new
CompuPro 80286/287 board (as of now they are shipping the C-step
80286 chip, which doesn't have the problems of the b step) and a
Z-80 SPUZ slave Z-80 p[rocessor.  This will run both processors
at once, and if fed a z-80 .com file that runs and the 286 is
available for other simultaneous work.  Seems more advanced than
a dual processor.  But I will also keep a vanilla z-80 around to
write books with until I'm sure...
jep