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What's more interesting than how the calculator works is how Sinclair was able to write the code for such a chip, which the article doesn't attempt to guess at.
by AsymetricCom 13y ago
What's more interesting than how the calculator works is how Sinclair was able to write the code for such a chip, which the article doesn't attempt to guess at. I wonder if he used some kind of boostrap on paper, looking at the algorithms.
- kens 13y agoI don't know about the Sinclair development specifically, but for the HP-35, they wrote a register-level simulator in software that let them develop the algorithms and single-step through for debugging. My favorite quote from the article: "Correcting a problem was a simple matter of changing a punched card or two." http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1972-06.pdf http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1972-06.pdf The article goes into a lot of detail on the HP-35 internals, so it's worth a look.
- deleted 13y ago[deleted]
- epo 13y agoNigel Searle, not Clive Sinclair, as it says in the 3rd paragraph.