Re: Tesla MH74S571 programming.
OK, if your PROMS meet the following criteria, which your original post seems to confirm:-
-They are DM Prefixed National Semiconductors DM74S571s, not Tesla MH74S571s.
-They are unused, unprogrammed blanks - used ones can not be reprogrammed.
-Then drop me a PM and we will take it from there.
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