26 Feb
2013
26 Feb
'13
12:19 p.m.
there were a few hhc peripheral's besides the tv
adaptor and printer.
Sure. IIRC there as an RS232 interface, for example. I have never seen one.
[...]
there was one other HHC set up that used only an HHC
and printer for
insurance companies - the printer attached directly to the HHC and the
custom insurance software was on a "capsule" (rom chip) that went in the
back of the HHC.
There weas a second 'unsurance version' This was also the HHC and
printter, but fitted on top of a 3rd-party EPROM box. The EPORMs in that
are not the smae as the oens that go into the HHC, they are 28 pin Jedec
pinout ones, fitted the normal way up in those Molex sockets (think of
the ROM expansion socekt on a TRS80 M100). Logic in that one is all
standard CMOS (74HC?)
The scheamtics of that are towards the end of the scheamtics you have
already found.
As for the display, missing rows ovr part of the length is an odd fult.
My geuss is that the backplane connections at that end of the dispay are
open. Probalby nothing more than poor contacts on the zebrastrip.
-tony