Hi Martin,
I’m sure Burroughs used (and maybe designed) these modules since the Panaplex was their creation.
I have a schematic for a similar Victor calc model 18-1721 and mine is 18-1441. They are mostly identical
except the 1721 has scientific functions and somewhat different logic but the display circuitry seems to
follow what I have in mine. The thought of a module swap had occurred to me and I will probably do it if
I can’t get a replacement. The thing is, it would only verify if the part is indeed bad - not how to get a
replacement if it is. Group member Ira also suggested using discrete parts. There is a hint of what is
inside the segment driver portion of the module shown on the schematic but not all 9 parts are ID'd.
I’m going to wait a little while for a possible replacement and, failing that, I will probably try the part swap
to at least verify my suspicions. Thanks to you and Ira for all the good suggestions.
All the best,
Rich