A3000s can be finicky, even 25Mhz versions. Back in my anachronism days i had at one time 2x A4000ds and 3 A3000ds for testing. One of the A3000d (25mhz) refused to take a Prometheus, period. It would work with every other zorro card I'd throw at it except prometheus. The prommy works with everything, including early 16mhz A3000d with oldest custom chips, so this was odd. Of all the prommy I ever sold, probably more than half went to A3000d owners. Yet I only ever heard of 1 other instance of this happening with a prommy.
That is probably why Commodore never offered the A3640 with A3000s :-(
