PDP 11 Unibus Machine Controller
Anyone here have insight as to what this was used for other than to
control some sort of splicing machine (my guess)?
This is just a custom digital to analog controller, the PDP 11 that used
this to interface with the machine equipment is unknown. I am guessing
an 11/35 or 11/40 system. The M series flip chips are smaller than your
typical 11 series controller cards.