41C Service Modules and module testing port dependencies

[dmh]

I am testing out the two 41C service modules via a NoV-64d programmed as a Clonix-D with both Service Modules (C/CX).

All the calculator tests work fine and seem straightforward, however, when testing various modules such as ROM, RAM, X-Functions/Memory it appears only one module can be installed at a time and it must be in port 4.

Both service manuals only mention installing the Service Module in the lower left port but also say install in any port (the Clonix-D configuration acts as the original SM in an odd port and the later SM in an even port).

I tested with both a 41C and a 41CV. I tested standard memory modules in the 41C and the QUAD memory module, Time Extended Functions/Memory in the 41CV. Cardreader tests were successfully done in both the 41C and 41CV.

Do the Service Modules require only a single additional module be installed for testing (eg ONLY Extended Functions, ONLY Extended Memory etc)?

Do the Service Modules require the module to be tested be installed in port 4 (except for the Time module)?

Not owning original Service Modules I can't compare with the real thing to see whether it could be a NoV-64d/Clonix-D issue.

Any information or advice appreciated.