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



#5

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?


#6

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

-Tim


#7

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).


#8

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.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-80 History, Design and Interesting Facts BShoring 1 397 11-30-2013, 08:50 AM
Last Post: Xavier A. (Brazil)
  Milestones:List of IEEE Milestones -> HP-35 AlbertTocarLoseggs 4 633 11-27-2013, 08:52 AM
Last Post: Massimo Gnerucci (Italy)
  HP-35 blind buy but buggy! Max Stone 7 1,122 11-11-2013, 05:56 PM
Last Post: Dieter
  Another HP 35 Red Dot on eBay Michael de Estrada 5 891 11-09-2013, 03:07 PM
Last Post: aj04062
  Trig vs hyperbolic handling differences in Prime CAS Michael de Estrada 3 522 11-08-2013, 06:26 PM
Last Post: Mark Hardman
  WP-34s ISP (flashing cable) again ;( Bernhard 16 1,674 11-01-2013, 05:02 PM
Last Post: Bernhard
  Re: [WP34S] Flashing Issues Les Wright 22 2,347 10-30-2013, 02:16 PM
Last Post: Les Wright
  HP-80 Teardown with pictures Max Stone 10 1,174 10-24-2013, 09:10 PM
Last Post: Walter B
  HP-80 CHS Exponent Curiosity Max Stone 4 687 10-22-2013, 02:39 PM
Last Post: Max Stone
  help flashing a hp30b to a wp34s john mantooth 3 535 09-25-2013, 08:58 AM
Last Post: Thomas Chrapkiewicz

Forum Jump: