Yes, I have tried it now. One thing that didn't work, was to write some short basic program and save it as a .cas. When I tried to mount it again, mess says: "Unable to load image" and "Internal error". If I save it as .wav it works ok, so it's not really important.
It would be nice to have memory expansions working also, Basic-G and Basic-F has some extra memory when you use it on a real machine. There's also the EM-5 32kb RAM expansion cartridge.
PS. here a picture of my Sord-system http://nevyn.organ.su.se/tbc/Computers/sordm5/sord_m5_system_600.jpg
I´m interested on your FD-5 disk system. It seems it use 3" floppy disks.
The MESS drivers (m5/m5p) have a 5.25" disk interface (?).
However, I can not test the disk interface because of missing disk images.
It will be nice if you can support us with disk images.
You can use the "-ramsize" parameter to add more RAM (36/68KB) for the MESS driver but I´m not sure it works.
A RAM/Memory test program in Basic will be not bad.
4KB (internal RAM) is the default value.
Example (by using the fullpath):
Mess.exe m5 -ramsize 69632 -cartridge "C:\Emulator\Mess\Software\SordM5\Cartridge\Basic-F.rom"