DEC fast reader/puncher M705, 710, 715 card schematics
vrs at msn.com
Thu Sep 8 18:41:54 CDT 2005
From: "Philippe Sonnet" <sonnet at sols.ucl.ac.be>
> While trying to connect my PDP-8/L to the PC04 fast reader/puncher, I
> realized that the schematics for the M705, M710 and M715 card posted by
> David Gesswein
> did not correspond to the ones I have. These are late "F" versions (1971).
> These cards include several DEC9801 one-shot TTLs as well as 7475 TTLs. My
> cards are 1969 versions and have no 9801 nor 7475.
I think you mean 9601. Anyway, I searched my corner of the universe,
and had no luck finding versions that don't use the 9601.
However, I have done some work with CAD drawings of these cards,
based on the assumption that I would have to build replacements,
(rather than find original cards somewhere). So if that interests
you (the M715 hasn't been finished yet), let me know (the
replacements do not use the 9601, since they are no longer available).
> My cards have been somewhat modified by the former owner of the PDP-8/L. I
> have to understand what he did in order to repair them (most cards have to
> be repaired because an overvoltage episode killed about one third of the
> TTLs in my PDP-8/L) !
More information about the cctech