Maybe it's known Amiga3000 and Tower make use of ZIPs for
expanding their on-board memory. These chips got quite expensive
today or are even no longer available.
This poor state is fixed when using SIMMfonie. It's a simple
mechanical adaptor which enables the use of standart PS/2-SIMMs
as the better replacement (like used in A4000).
It's important to know: The adaptor for A3000 is different
to the one done for A3000T. The distance of the ZIPs on the
mainboard was simply different. Again, they're not interchangable!
- only available at 2nd hand market