I haven't got the time to teach you all..... -sorry-
Studio-software and the maxflash-kit is made by atarimax.
The custom cartridge was a one of a kind.
BTW I have send you the info/source about this somewere around "maandag 17 augustus 2009, 13:06:35"
But here is the spec:
D500-D507 <-> IDE-access
Any access to D520-D52F will switch on (yes, instantly) bank 0-F
Any access to D530 (D53x) will disable ROM (you get the atari-ram back instantly).
Succes,
Sijmen.