W076/M452 replacement cards

From: Mike Cukr <cukr_at_massnet1.net>
Date: Thu Nov 27 09:11:34 2003

e.
>
> I found them. I'd still need relay part number 4915. There are also some
> things called "thyractors" called for.
>
> > No idea where you'd get the relay these days. I wonder if you could
> > design a solid-state switching circuit that would work, with an
> > opto-isolator on the input
>
> Maybe, if I had specs for the relay. If I had the specs, I might even be
> able to tell if I have a prayer of delivering sufficient drive current,
> though I'd still prefer to test on real hardware before having a bunch of
> boards manufactured.
>
> Vince
>
>
Some place in the pdp-8E/M docs there must be specs for the TTY and
reader control circuits. Take a look at the TTY I/O prints and see
what devices DEC used to drive the relay circuit.

Mike
Received on Thu Nov 27 2003 - 09:11:34 GMT