128Mb limitation: not enough address lines to decode more than 128Mb (or 4 x 32Mb).
Using a system like the Blizzard PPC (which accept 2x 128Mb SIMM sticks) will ease the things a lot. Then you can use four 128Mb SIMM sticks on the CyberStorm, but the firmware needs revision and some solder to the SIMM holders. Two more address lines and the (now needed) multiplexer to resolve the addresses.
