MMUCAT - PowerCL_EXT NONEXISTENT XROM call

[dingebre]

First, Thank you Ángel for these amazing modules!

I have:
HP41CL, version 4 PCB, current as of mid January 2017 (I have tried it on two HP41CLs with the same configuration with the same result.)

PGCAT:
3: EXT FCN 3B
4: Library#4
5: Time 3A
6: No ROM (Left open for PIL Box printer)
7: No ROM (Left open for PIL Box mass storage)
8: YFNX 2B
9: PWREXT B3
A: HEPAX'4H
B: HEPAX RAM
C: No ROM
D: No ROM
E: No ROM
F: No ROM

When I execute MMUCAT in the PowerCL_EXT module, it returns "NONEXISTENT" at line 7 which displays "07 XROM 05,31"

I thought that maybe I needed the CCD OS/X ROM and plugged it in (XROM #5?), but that didn't help.

I did a CAT2 and "entered" the PWR ROM catalog and MMUCAT is there where it should be. If I "GTO MMUCAT", I get "NONEXISTENT". I can't "COPY" it, or print it. When I go into "PRGM" mode after the error, there is no global "MMUCAT" label. Line 01 is a numeric "2" and I'm stopped at line7 with the "XROM 05,31" call. When I look at and compare to the listing in the manual, there is little resemblance as I step through the code on the calculator which makes me think I am not in the "MMUCAT" code.

I don't understand. What am I missing?

Other functions in the other PWREXT module pages seem to be fine, although I haven't even really begun to test them all (love the unit management).

David