The ACA 500 is a very nice card, works great on my A500 1.3.
I have OS3.1 installed on the memory card and also booting with the 3.1 ROM.
But the ACA 500 does not work on my A500+ although I don't no the revision of this machine, that could be the problem.
Only ASMone does not like the extra Fastram of the ACA500 1.3 + ACA500.I need to start it twice. The first time ASMone gives a guru, the second time it is ok.