FW: Need Heath/Zenith H/Z-90 schematics (repost)

From: Patrick Rigney <patrick_at_evocative.com>
Date: Fri Sep 5 17:30:01 2003

> > I've been working from a set of H-88 schematics for a long, long time,
> > extrapolating and tracing differences between the '-88 and the '-90.
> >
>
> Do you mean the 89? Regardless, what differences have you found so far?
>
> g.

Glen, no, I mean '90. The -90 added some additional traces on the CPU
board, removed a jumper, etc. There are also changes apparent on the
terminal logical board, and the video board, and in the case of one machine
I'm working on, there's an additional board between the video board and the
yoke that looks "native." Even the serial cards seem to come in two or
three different revisions. --Patrick
Received on Fri Sep 05 2003 - 17:30:01 BST