HP 41c STAT 1 module version 1A

[rprosperi]

(09-14-2021 01:45 PM)dmh Wrote:  Just wondering what serial number / year your STAT ROMs are? Is my 1A 19 serial number the earliest STAT ROM? When was the STAT ROM released?

I have 2 x "1B" Modules, the date codes are 2027 and 2348.

I've no idea about Application Pac release dates, I only recall that STAT was available at 41 launch; Didier's find in the PPCJ seems to shed a pretty clear light.

Most likely the 1A module was made and sold briefly and then changed over to 1B at which time they consolidated the "*c" code into "*a". Possibly, these helper routines started out longer and/or for slightly different purposes, then eventually shrunk down and no one noticed that *c could be included in *a with no loss of functionality.

It's very likley there are other differences (bugs) between 1A and 1B, as HP surely would not have incurred new mask ROM charges simply to consolidate the helper routines, while on the other hand if they were correcting some bugs, then it's 'free' to also fix the helpers.

Interesting discovery, thanks for sharing it here.