But would all of those pins necessarily need to be connected to the FPGA. Or could the FPGA be made to have the data lines, minimum address lines, minimum control lines. Since the additional address lines would be for extra memory therefore not need to go to the FPGA and the control lines would not need to go there also. Maybe set the MiniMig up the it has a header which connects to a CPU/Memory/Additional (IDE, ZORRO, etc). Just use the MiniMig core as the custom chipset replacement (sound, graphics, I/O). The MiniMig should still have the onboard memory but be used as ChipRAM and Kickstart. All other FastRAM would be with the CPU. Just a thought. Wouldn't be much different than some other Amiga upgrades (jumper wires everywhere)