yes, some of the old Maxxum Flashes work, but it would be nicer if you mentioned which ones work, and what functions you can loose. I don't know or I would post that info. Someone will, hopefully, jump in here with some educated info soon.
Joe Holmes
Sony α550
Sony HVL-F42AM Flash
Sony DT18-55 F3.5-5.6 (Kit Lens)
Minolta Maxxum 50 1:1.7(22) Prime
Minolta 35-70 F4 (Mini Beercan)
Minolta 70-210 F4 (Beercan)
Minolta 28-135 F4-4.5 (This beast is pretty heavy)
Minolta Maxxum 100-200 F4.5
Quantaray D28-90 1:3.5-5.6 Ver 5
Tamron DiII 55-200 1:4.5-6