Oldtime-

The 414 was the fully manual one. The 415 was fully automatic (DC signalling). When your circuit would get switched out (usually over the weekend and always without notice) from copper to carrier the 415 would no longer work (later there was a mod for it). The 416 was half and half - one way automatic, one way manual.

I remember unwrapping and rewrapping card slots. A PITA. But if you were installing 414 or 416 cards you needed the 259 because the cards were 20 pins. I think it was Sanbar (but I could be mistaken) who made 584 panels where the last slot or two in each 13 line panel was 20 pins. Or maybe they had panels that were all 20 pin slots. I really don't remember anymore.


Sam

"Where are we going and why are we in this hand basket?"