Re: HP25 opgrade Message #3 Posted by Paul Sorensen (Denmark) on 7 Mar 2001, 4:09 p.m., in response to message #2 by Andrés C. Rodríguez (Argentina)
Hi Andrés !
You are right, but then again:
The overall power consumption in the HP-25 unit is made by the LCDs. In the old days gays realized this fact and they made some changes in the circuit so they could bypass the on / off switch for power to the microprocessor.
The result was a "functional" HP-25C. From the front panel you can reset and clear program memory, so there is no need for an on / off reset.
The bypass circuitry can be achieved in many ways. I have, some 25 years ago, seen it done in a very smart and simple way - but I can not remember how it was done.
Does anybody know the trick?
After daily use for 26 years as a teacher and technical advisor my HP woodpecker and coconut in a strong part of my life.
Thanks
Paul
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