Re: Studer / Revox etc BiPolar PROMS! Question and concerns!
Looking back at the schematics in post 9,...
these proms seem to simply be look-up tables as an alternative to some combinational logic. There are no flip-flops in them so they rely on an off-chip counter to sequence things. You could probably replace them with any of:
A small board wit several logic chips
A programmed PAL
A small CPU
It should also be possible to work out what the combinational logic must be, either from considering the operation, or from monitoring waveforms on a working unit.
The programmes for the original parts might not be disseminated, but it's a poor secret which can be deduced.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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