In Search of 15C+ ROM image

[tgwell2]

I get no indication of a low battery when I drop voltage (other than the screen getting dim). If I drop the current limit of the supply and hit a key, it shuts off and wipes memory. This is on the 08/09 FW version.

Here's a pic of the calculator. It has the normal percentage sign, not the elongated. No Rev (best I can tell). I had been working on a dumbed down programmer's calculator on this, using the SDK... But this has been an interesting diversion.