I would be interested to know what printers used the
same electronics.
The 82906 mainboard contains an 7810 and a 8042 IIRC, which makes it
later than the IBM 5152 (which I have the schematics for of course). That
uses an 8048 and an 8042, I suspect the HP82905 does likewise, but
that's the sort of thing I'm trying to discover...
MX80/RX80 comes to mind. I'd tell you the brazilian ones which were
clones, but I doubt you're interested