HP Forum Archive 19

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HP-35 and HP-80: Flashing display differences? Message #1 Posted by Mark Henderson on 10 Jan 2010, 4:40 p.m. 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? Message #2 Posted by tim m. on 10 Jan 2010, 5:08 p.m., in response to message #1 by Mark Henderson 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? Message #3 Posted by Mark Henderson on 11 Jan 2010, 10:09 a.m., in response to message #2 by tim m. 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? Message #4 Posted by Eric Smith on 11 Jan 2010, 1:49 p.m., in response to message #3 by Mark Henderson 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.

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