HP41-CX problem with Printer and Digitaldrive and NOV64d

[Hiwi]

Hi all,
i have a HP-41cx with IL module and nov64d module.
On the loop i have a cassette drive HP84161 an an IL printer HP84162.
The nov64d has an active Hepax (tried both 4h and 1d) and CCD-OSX module installed. Others rampages are free. (showing NO Rom as expected)

I have some programs on the Hepax ram and HEPDIR shows 2310 or so regs free.

If the printer is on HEPDIR shows an ERROR: 'NO H-FILEYSYS'. I have disabled the switch on the IL-module so the printer rom does not swap to rampage 4, but no sucess.
I cannot explain this behaviour.

If the cassettedrive is the only device on the loop I can access the HEPAX ram as expected.

What am i doing wrong?

Ralf