HP 12C Identification

[rprosperi]

(07-14-2021 02:34 AM)brouhaha Wrote:  AFAIK, all production versions of 12C Platinum (and Prestige) use the SunPlus (now GeneralPlus) microcontrollers.

There are two versions, most easily distinguished by whether there are parenthesis as the blue shift of the STO and RCL keys.

Also, note that the earlier Platinum machines without parenthesis also don't have the UNDO feature added in the later units, and as a result are faster; in fact the fastest of the 12C flavors until the 12C+ came along which is dramatically faster than any others in the 12C family.