* Button triggers NMI
* 8K ROM data has 4 regions. There is an NMI vector at &0066, &0866, &1066 and &1866 which indicates each of the 4 regions is selectable and mappable into the range &0000-&7ff. What is not clear is if the regions repeat or not in memory space. * Region 0 appears to be save using a filename of "DraySoftONE". * Region 1 appears to be load. It has the text "EVESHAM MICROS PRESENT DISC WIZARD (v1.2) Loading". * Region 2 appears to be saving for "DraysoftTWO". * Last appears to be loading for two. The 1/2 Switch chooses between which 4k, then the load/save chooses between the 2k within that 4k.
* Uses direct FDC disc access for loading/saving.
* Uses an I/O port &f0e0