Right! I've got my 44 female -> 40 male IDE cable now (thanks Amigakit!) so I have connected a standard 40 way IDE cable to the A1200 directly to the motherboard and I can still use two devices. So I have now got a HDD and a CD-ROM connected to the Amiga without the need for the buffered interface. And guess what? It works! OS4 is now installing :-D
Still having problems with the BVision. It seems to be working as it doesn't use AGA when the BVision is connected, but I can't get a display up on the VGA monitor. It did work for a while, so maybe it just wasn't connected properly. It's disconnected now while OS4 is installing, and I'll try re-connecting it afterwards and try it again.
Thanks for all the help guys!
:pint:
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moto