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