The upgrade also allows one to select to increase the CPU speed from 7.09 to 28.36 MHz but it requires an FPGA core to actually carry it out (which works with the 16 MHz 68SEC000 chips).
The upgrade also allows one to select to increase the CPU speed from 7.09 to 49.63 MHz with a 4kb zero waitstate cpu cache. But it requires an FPGA core to actually carry it out (which works with the 16 MHz 68SEC000 chips).