Re: Just got an HP-35s!

John H Meyers wrote:
This is very common practice -- HP's own "12C" continued to appear
in a package looking just like the original, yet it was not identical,
perhaps even affecting some of its computational results (and bugs);

The HP-12C has used the same firmware from 1984 to the present. There
may have been some bug fixes between 1981 and 1984. I'd like to get
a 12C manufactured in 1981 to dump the ROM for comparison.

The electronics in the 12C has undergone multiple revisions. The case
has had slight changes at times, and a major change when they replaced
the three button cells with a single lithium coin cell. They stopped
using double-shot injection molding for the keys. I'm not sure whether
the current 12C still uses metal dome switches.


The HP 12c Platinum is a different product, and does not run the same
firmware as the HP-12C. There was at least one major revision (total
rewrite?) of the 12c Platinum firmware, which added the parenthesis
and undo functions. This was done with no fanfare as a "soft roll".

The HP 12c Platinum 25th Anniversary Edition and the HP 12c Prestige are
functionally equivalent to the newer 12c Platinum.

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