|Re: Accelerating (an older?) HP-12C|
Message #9 Posted by Karl Schneider on 3 July 2006, 3:41 a.m.,
in response to message #8 by Antonio Maschio (Italy)
I don't believe that Kinpo had any role in a 2001 Chinese-made HP-12C, which used what I believe is the same class of processor as did all other Voyager-series models (except the 12C Platinum).
An excerpt from Eric Smith's comments in the article linked in my earlier post:
In later HP-12C prodution, the CPU and RAM/ROM/Display chip were integrated into a single chip, the 1LQ9. I do not know whether any other Voyager models were ever made using the 1LQ9. It is probably possible to speed up a Voyager using the 1LQ9 by the same technique, but neither Ken nor I have tried it.
Even more recently, the design of the HP-12C changed to use a single coin cell rather than the traditional three button cells. Since the operating voltage is reduced, they may have had to redesign the electronics yet again. I have not opened one of these models.
The newer HP 12C Platinum uses a Sunplus SPLB20D microcontroller containing a 65C02 equivalent CPU core.
Edited: 3 July 2006, 3:43 a.m.