Hello jochen, One of my A500 is a rev 8a.1. It has ROM 1.3 and 512 Ko chip, Plus a RAM expansion. It is complete, working, and in good condition.
Say me if you are interested, because I search for a A2000 accelerator card and you seems to have one to sell.
We could trade, so the price of the accelerator card could be less expensive for me.