35S Insanity

[Steve Simpkin]

(11-30-2024 04:55 PM)naddy Wrote:  ...
Is it possible that they didn't have/couldn't use the source code and re-implemented everything from scratch, modeled on the 32SII?

Yes, that is exactly what happened. HP did not design, code or manufacture the HP 35s calculator. HP provided a detailed set of specifications for the functionality of the HP 35s and its form factor to Kinpo Electronics. Kinpo then designed the calculator circuitry, hardware, wrote the software and manufactured the calculator for HP. The HP 33s and HP 35s went through a similar process. They are all using a variations of a Sunplus CPU which has a core based on the 6502 microprocessor.
https://en.wikipedia.org/wiki/HP_33s
https://en.wikipedia.org/wiki/HP_35s