10 Dec
2001
10 Dec
'01
10:32 p.m.
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
The H89 is a little strange. It's really a serial
terminal (almost the
same as a H19) and a Z80-based computer in the same box. Yes, they
communicate via an RS232 link between the terminal logic board and the
CPU board.
A *little* strange?
So the problem could be in just about any area of the
unit.
Great! ;>)
I would start by ignoring the computer part for the
moment and turning it
back into a terminal. Disconnect the 0.1" header
jumper between the
terminal logic PCB and the CPU PCB. Connect one of the serial sockets on
the back (normally connected to the triple serial card plugged into the
CPU board) to the connector on the terminal logic PCB. And then short
pins 2 and 3 on this serial socket.
[snip a lot more really expert advice]
Tony, thanks a million. I'd really like to get this baby up and running,
as it's the only machine I have which uses 5.25" hard-sectored floppies.
I'm pretty sure I'll be able to identify the components you mention by
eyeballing them (I have no docs) and am looking forward to doing this in
the next week or so, but in the meantime, can you answer just one more
question for me:
How do I open this friggin' box!@!$#&!
TIA,
Glen
0/0