Is it possible to disable the autorun for a 41 ROM

[twdeckard]

Is there any clever way to defeat the Autorun on an HP41 ROM?

[Sylvain Cote]

Very few ROMs has autorun built-in, some uses flag 11 (run at current location on wakeup) and some has an mcode implementation.
To answer your question, in general it is not possible, but in specific cases it is possible to work around it.
Which ROM are you using ?

[twdeckard]

There is a third party aviation ROM called AV1 that I have played with in an emulator and its for sale on TOS. I wouldn't use it but would get it for amusement value except it trounces on the routines I do use and obliges me to take the calc out of user mode and restore my key assignments when I turn it on.

It looks like an impressive ROM and I understand that they were using the 41 as the backbone for a dedicated appliance so the autorun is totally appropriate.

Thanks for the quick response.

Todd

[Sylvain Cote]

Hello Todd,
This ROM only contains user code.
The RPN code is using local alpha labels, flag 11 (autorun) and flag 27 (user mode, local alpha label automatic mapping).
So you are lucky.
After using one of the ROM program, clear flag 11 (CF 11) and leave the ROM space with: GTO ..
Local alpha labels mapping are only active when the program having them is active.
Sylvain

[twdeckard]

Excellent. Thank you. If I get motivated I'll rework the ROM to remove the auto-run.

Best
Todd