So apparently, after come chat in SAX, on the CE the Prod # on the About screen is not part of the Boot code or unique to each device. It's the OS's Prod #. Surely someone knew about this already.

Here are all the CE OS's Prod #'s:
Code:
Send the OS and that prod # will be on the About screen.

The CSE OS's and the Monochrome OS's seem to have no affect on the Prod # though.

Edit: Added 83PCE OS's

In the list you posted, the last 4 digits are just the OS build number.

You missed the protos

5.0.0 EVT3 0024
13-07-05-1800

5.0.0 EVT3 0058
13-07-05-3A00

Interestingly since it is based off the build number, 5.3.1.0058 and 5.0.0 EVT3 0058 have the same prod #.

So it appears that rom8x handles the Prod# in an incorrect way that causes 0A-1-01-01 (zeros in memory, I assume) to be used instead of the proper number.

Here are the TI-84 Plus OS Prod#'s
Code:


Edit: The second to last number in the Prod ID is the major version (5[.0.0.0089] for the CE, 2 for the 84+, etc.) the last number, as stated by DebrouxL, is the OS build number: (i.e. [5.0.0.]0089 == 5900h, [2.]30 == 1Eh).

The TI-83+ looks like it fits the patterns mentioned above (not that there was any reason to expect otherwise):
1.19: 04-1-01-13

But either the 68k calculators do not follow the same scheme, or they have an extra, internal build number, & also the penultimate number is not the major version:
TI-92+ HW2 2.09: 01-1-C-57
TI-89 Titanium (both HW3 & HW4) 3.10: 09-2-E-53

Note that all 4 parts are different between those two...perhaps comparison with other OS versions (especially 1.x) & other calculators (TI-89 non-Titanium, TI-92 with Plus module, V200) would reveal the pattern for AMS.

Here's a few 68ks of mine
TI-89

(proto) 1.02: 03-0-1-2E
(proto) 1.00b8: 03-0-2-17
2.05: 03-1-9-4C

V200

2.06: 08-2-A-5D

TI-92 Plus

2.05: 01-1-9-4C

TI-89 Titanium

3.00: 09-2-D-19

For the TI-68k series, the making of the product ID is documented, the online version being https://debrouxl.github.io/gcc4ti/cert.html#cfindfield .
The header of AMS 3.10 for the 89T contains:

Code:

ROM_CALL AB_prodid calls copen, copensub, cfindfield, cgetfnl and finally sprintf.

The I variable in https://github.com/debrouxl/tiosmod/blob/master/tiosmod.c#L373 and below is effectively the contents of the 802(0) field. CalculatorType and I are obtained through a dirty shortcut; I made tiosmod+amspatch years before adding cert field parsing functions to libtifiles, https://github.com/debrouxl/tilibs/blob/master/libtifiles/trunk/src/cert.cc . No absolute need to do it the pedantically correct way when the dirty way works on a closed set of versions, anyway.