Date   : Sat, 17 Jan 1987 03:01:00 EST
From   : "Bruce H. McIntosh" <Z8BHM%SCFVM.BITNET@WISCVM.WISC.EDU>
Subject: connecting H89 to IBM PC

Hello!  I've been trying to connect my H89 to my pc clone (generic with
an AST I/O Plus2 copy) via serial ports.  I've been largely successful;
I can communicate between the two machines with no problems.  The only
snag is this:  when the H89 is plugged into the PC AND powered up, the
PC won't power up!  I've about driven myself nuts moving jumpers and
rearranging cables, but the only time I've managed to get the PC to come
on with the H89 powered on and plugged to it, I also managed to disable
the serial ports!!  Could some kind soul out there please give me some
kind of suggestion, perhaps a preferred cable configuration?  Thank you
in advance for any help!!!

ps- just goes to show, the RS232 standard isn't!  :-)