HP-41C weird program behaviour

[rprosperi]

(03-19-2023 06:46 PM)JurgenRo Wrote:  Hello everyone!
I have an HP-41C which shows a weird behaviour when it comes to programming with LBLs and GTOs. Running a program (by XEQ, R/S or SST) with a mumeric Label, LBL01 say, GTO01 will send the program pointer "anywhere" but not to the LBL01. Moreover, "anywhere" seems not to be a location in normal program memory but shows characters that indicates the program pointer to be into firmware area or something (reminds me to what I'm seeing when doing SP). Any thoughts?

Edit: typo

Thanks a lot
Juergen

There's not enough information here to give you useful suggestions; please list the program.

Are you using any synthetic instructions?

Are you using any exotic modules (e.g. CCD, ZENROM, HEPAX)?

Another easy thing to try is to replace the current LBL 01 instruction (delete it, then retype the same instruction) followed by a PACK and try again.