I use a Netgear MA401 in my A1200. Prism.device runs it perfectly when its plugged straight into the socket. I don't know what the solution with the right angled adaptor is. However, I can try and help.
Does the link light come on with the card inserted?
Have you tried booting the A1200 and then inserting the card ?(I believe the card reset problem with the A1200 requires you to do this unless you install a patch or mod the hardware)
Does the system recognise that the card is there at all?
I never used prepcard for mine, it just worked without it, so I can't help you there. Hopefully it's something simple though. :-)
