Thank you everybody!
I found the WW project using the Texas chip but the one I remembered was definately TTL based.
Seems my memory was only faulty in the name of the magazine, Practical electronics, not WW.
The dates fit my recollection, if PE started a year long project in July 72 and sinclair launched their pocket calculator in Sept 72 that would be about installment 3.
Quote:
Originally Posted by dave_n_t
I'm also fairly certain that there was a letter to the mag complaining that the TTL calculator was superceded by the single-chip versions now available, but the editor responded that the educational value of the Digical series was worth it, even if you didn't make the thing.
dave
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That was as I recalled it.
I attach a quote from the editorial of October 1972
Peter