Basicly I'd say the original 23W A1200 PSU is too weak to power much else than the the A1200 unit itself. A 50W A500 PSU will give you a margin to power the turboboard but don't expect miracles... it wouldn't power my A1200 with B1260, internal soundcard and scandoubler and an external diskdrive for much more than an hour or two before the PSU was so hot one could hardly touch it. :-D
