Strange DEC PC05 paper tape reader: doc for M705 needed
j_hoppe at t-online.de
Tue Jun 23 09:54:00 CDT 2015
I could acquire *four* rotten PC05 Papertape Reader/Punches for PDP-11.
I'm now restoring them.
One of these is strange:
Normally, the feed hole (between data hole 3 and 4) is used to clock in
bits from the data holes.
But this very special PC05 does not have a phototransistor for the feed
hole, so the data clock signal must be generated by the stepper motor
Maybe it's a very old model: the READER CONTROL module is M705, not the
usual M7050. And there's no doc for it.
Does anybody has a FPMS with schematics for the M705 modul? Perhaps as
part of some PDP-8 doc?
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