Reading old HP-65 program cards
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03-02-2021, 11:39 PM
Post: #5
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RE: Reading old HP-65 program cards
(03-02-2021 10:47 PM)Gene Dorr Wrote: Re: visual decoding of the card -- I actually wondered about that for a while, as I too remember the discussion. In fact, there's a decent image of the magnetic recording on those cards on page 7 of the November 1976 HP Journal, in an article about the HP-67. But I am extremely skeptical that it could be decoded visually -- according to Bob Taggart, the density is around 300 bits per inch. Some HP-65 card info here near end of document. http://teenix.org/ClassicNotes.pdf cheers Tony |
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