x49gp/docs/MEMORY

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Saturn CPU Structure at
08003340
contains
u32 Read[257]; Saturn -> ARM mapping table
u32 Write[257];
armptr = Read[saturnptr >> 12] | ((saturnptr & 0xfff) >> 1);
"standard" Saturn mapping:
00000 -> 00060000
... ROM
7ffff -> 0009ffff
80000 -> 08040000
... RAM
fffff -> 0807ffff