41CL Strange Behavior??

[Sylvain Cote]

(07-26-2021 04:10 PM)Neve Wrote:  Is this normal?? Should I be worried?

Yes and no.

(07-26-2021 04:10 PM)Neve Wrote:  If it’s not normal, how do I fix this issue?

You cannot.

When Monte created the 41CL 10+ years ago he did not know at the time the HEPAX method of dynamically moving its ROM around,
so he statically assigned its 41CL Extra Functions (YFNZ) ROM to page 7 and in so creating a conflict with the HP-IL module.
This is explained in the 41CL User Manual at page 18.
Because it is part of the core system, it cannot be updated with a normal ROM update and we all have to live with it.

Rule #41: always remove the HP-IL module before disabling the MMU.

Sylvain

Edit:

(07-26-2021 04:10 PM)Neve Wrote:  The unit works fine when the MMU is enabled, and it also works fine with my other 41CX unmodified machine. It also works perfectly with the PIL-BOX.

It is because you have mapped the YFNZ or the YFNX ROM to another page and you left the page 7 free in your MMU configuration.