Techone:
@cr0shThe printer in question is : Cannon K10149 Centronic / Parallel Interface
Here the inscription of the "8255"
QH7-8787-03
V1.04
M5388002E-F1
8255B01I may jump to conclusion to early...
Got a picture of the chip handy? I've got a few 8255 rattling around in my shop; typically, the number will be in the first few numbers on the IC, not at the end (where it would be a date code or a batch number or something). Those numbers also look like "house chip" markings - were there any other ICs on board the PCB? Is it a 40 pin DIP IC? If it is, there were more than a few other chips in that package; it could be a some kind of 8051 or Z80 (or some other 8-bit) processor, with likely a ROM mask (to act as a printer controller) - the 8255 is just some other number.
Then again, it could be an actual 8255...
