What is not clear is that when the chosen region is mapped into the Z80 memory space if the region in &0000-&7ff is repeated through to the end of &3fff.
- ** Region 0 appears to be for saving "DraySoftONE". - ** Region 1 appears to be for loading "DraySoftONE"- ** Region 2 appears to be saving for "DraysoftTWO". - ** Region 3 appears to be for loading "DraysoftTWO"
It seems that the "1/2" switch on the PCB chooses between which 4k (assumption it is connected to A12 of the EPROM), then the "load/save" switch chooses between the 2k within that 4k (assumption it is connected to A11 of the EPROM).