That board is a GO DIRECT LTD A1200 SIMM RAM M1205 IssA - I think!
Really, really, really rare memory board! The empty socket is for a FPU. ( Not that you generally need one with amigas )
RAM modules look like the very old style 30-pin - if true I hope you don't have faulty ones as you're very unlikely to find replacements.
As you're having memory issues it may be worth GENTLY disassembling & cleaning. ( The FPU part -> Ram part too - I think that's a connector )
I'm not going to be much help with the virtual floppies I'm afraid - It's been too long for my memory...
Hopefully someone here has done that more recently. ( or has a better memory )
Nothing in PCMCIA slot = no conflicts so that's not it.
Best of luck.
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