HP41 and ProtoCODER on the road again...

[pilou45000]

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Sure, you need to disassemble both ROMs (NFCROM-1B:ProtoCODER & PCODER-1A:ProtoCODER2), understand the code, do the modification that you want and reassemble the new ROM. The easiest way, I think, would be to use SDK41 Release 6.1 (search for "SDK41 Archive" on google)
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Merci Sylvain,

That's what I did, with SDK41R6-32 (works on Windows 10) but it's not easy for me to understand MCode, I'm a beginner...