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Which calculators had no known bugs?
11-13-2017, 10:04 PM (This post was last modified: 11-14-2017 04:40 AM by PANAMATIK.)
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RE: Which calculators had no known bugs?
(11-13-2017 08:13 PM)teenix Wrote:  That is true and it isn't true. :-)

Looking at the microcode, during a running program, the HP29c doesn't test for a key press when it is executing these programmed keys...

0 - 9, CLx, EEX and CHS


Thanks Tony for this exquisite deep look inside the code.

The intention of the HP engineers now becomes clear. If you have a sequence of number entry in your program like 123.45 CHS EEX 5, R/S (manual stop) should not break the number into two parts when restarted. Great idea.

I admit that it is very unlikely to have a nonsense program, which consists only of numbers. Therefore nobody has found this endless loop in the last 40 years. I did, because I tested the correct storage of a complete 98 step program in the LP circuit flash memory, entered all 1s and accidentally started the program.


That's one small step for a man - one giant leap for mankind.
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RE: Which calculators had no known bugs? - PANAMATIK - 11-13-2017 10:04 PM

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