A question about a halfnut 41C (not CV/CX)

[Sylvain Cote]

(06-23-2022 10:50 PM)rprosperi Wrote:  

(06-23-2022 07:46 PM)Massimo Gnerucci Wrote:  Can't remember which of the gazillion modules I have around here I used to check ROM versions years ago. Could you point me to the right one? And a micro how-to, maybe?

The 41C Diag module, which can be easily installed in a CLONIX/NoVRAM module.

Yep! that is what I did.

I bought a Clonix-D module just to hold the two HP-41 service modules.
There is an option in Diego's Windows application that creates the above module.

SM-1C is the original service module, targeting the C, CV, memory module, card reader and 4/8K ROMs.
SM-2A is the follow-up service module, targeting the CV, CX, X-F/M, X-M, Time and 4/8/12/16K ROMs.

When I plug my module in an odd port it activates the SM-1C ROM and when I plug the module in an even port it activates the SM-2A ROM.


Once the service ROM is activated, press the minus [-] key to get the ROM ID → [ROM 0:H 1:F 2:F]