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HP-35 and HP-80: Flashing display differences? - Printable Version

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HP-35 and HP-80: Flashing display differences? - Mark Henderson - 01-10-2010

The HP-80 has a (charming) behavior of flashing digits on the display briefly when calculating, for example, SQRTx, much like a programmable Classic while running a program. The HP-35 (and other Classics) don't do this for pre-programmed functions).

Since the HP-80 and HP-35 were basically the same electronics (HP-80 with more ROMs), does anyone know why the different behavior? Seems to me SQRTx (et al) would be implemented the same way on both?




Re: HP-35 and HP-80: Flashing display differences? - tim m. - 01-10-2010

I'm presuming that the ROM implementations are different in each calculator, resulting in the distinct behaviors.

-Tim


Re: HP-35 and HP-80: Flashing display differences? - Mark Henderson - 01-11-2010

Certainly there are differences, I'm interested in why this behavior in the HP-80 (flashing the display) when it isn't present in other Classics, particularly it's closest neighbors (HP-35, HP-45).


Re: HP-35 and HP-80: Flashing display differences? - Eric Smith - 01-11-2010

As Tim said, the difference is in the ROM code. If you want to know *why* the ROM code is different, I suppose you'd have to track down the engineers that wrote it and ask them.