Memory map in OS mode: (firm 3+)
256KB 0x000000 – 0x040000: OS ROM area
768KB 0x040000 – 0x100000: module ROM area
1MB 0x100000 – 0x200000: reserved area
2MB 0x200000 – 0x400000: mirrored 8kb of backup ram (if RAM_ON 1)
2MB 0x200000 – 0x400000: game ROM (start of SSF2 rom if RAM_ON 0)
4MB 0x000000 – 0x400000: game ROM (if in ROM_MAP_PORT written 1)
0xA13000 - 0xA1300A: control registers
OS ROM memory map:
64KB 0x000000 - 0x010000: bootloader
64KB 0x010000 - 0x020000: OS
64KB 0x020000 - 0x030000: reserve OS copy
64KB 0x030000 - 0x040000: settings data
*reserved OS copy can be run if A+B+C+UP keys will be pressed before system power on
*new carts use A+B+C combination for reserved OS copy loading
