Hi,
I know it works because my friend had done it, sometimes he had his A500 up on bricks, because of the way the cards had to be plugged in. Just look at the number of the pins on the A500 and the ram expansion board and match, pin 1 should be on pin 1 and pin 86 on pin 86 etc.
By the way I should say this "all responsibility for this act rest soley on your shoulders, since my A500 is up in the attic somewhere and my A1000 is gone, please the research on looking at the expansion slots on both the A1000 and A500 on the old hardware page, before trying this, I have never tried this myself, so I will take no responsibility for an A500 blowout"
sorry but that is the most I can help
smerf