3000+ motherboard only exists in (working) prototype form (extremely rare most were destroyed)
Index Informations 'Access' (rare as funk though and £££)
BoXer & InsideOut card (also made by Index Information)
DCE Wonder TV 6000
4000 does not have PCMCIA as standard (there maybe a zorro card but I doubt it). I'd just use a Deneb card for transfers anyway
edit: horace quicker than horace on the ski slopes!