B&C Microsystems 1409C Programmer

[ehobby]

This might be a long shot but...

I have a couple of old 1409C programmers from the late 80s. I want to make some modifications to the hardware but cannot find any documentation for the 1409C.  There is a manual floating around the Internet for the earlier 1409 version but it is electrically and PCB layout different from the 1409C.  I know these were popular in the 80s so wondering if someone still has the manual/scan for the C version.  Schematically, I would expect five ZIF sockets and a dip switch labeled S7.  The 1409 only had two ZIF sockets and no dip switch.
If you have a schematic or the whole manual, please let me know if you can provide a scan.

Thanks