Help identifying 41C custom ROM module

[rprosperi]

The 2 best places to look are:

Matthias' 41 ROM Database, here:

http://www.hp-collection.org/41database.html

and the ROM listing in Monte's 41CL manual, available here:

http://www.systemyde.com/pdf/sy41cl.pdf

In Mathias's database, it's probably easiest to search by ROM ID, assuming you can get that with Diags or another utility module (PPC, ZENROM, etc.)