HP 12C+ Firmware

[brouhaha]

(05-25-2024 09:39 AM)Stevetuc Wrote:  The files you had trouble with I am unable to find the original firmware embedded within

I think those firmware versions had the Nut code expanded inline into sequences of ARM code, in order to speed things up by avoiding an outer interpreter lfetch and decoee loop. In the early 1990s I did something similar with an experimental version of my Atari vector game simulator.

Since HP went back to having a Nut ROM image, perhaps the performac3 gain was not as much as they expected.