68k memory map
| Start address | End address | Size | DEF Name | Description |
| $000000 | $0FFFFF | 1MiB | First fixed bank of the 68k binary (P ROM or PRG file) | |
| $100000 | $10F2FF | 64KiB (Mirrored up to $1FFFFF) |
WORKRAM | User RAM |
| $10F300 | $10FFFF | BIOS-reserved RAM | ||
| $200000 | $2FFFFF | 1MiB | Second bank of the 68k binary (bankswitch possible on some carts, $2FFFE0 ?) | |
| $300000 | $3FFFFF | Memory mapped registers | ||
| $400000 | $7FFFFF | 8KiB (Mirrored) | PALETTERAM | Palette RAM |
| $800000 | $BFFFFF | 4 KiB (Mirrored) | MEMORYCARD | Memory card (Even bytes are always $FF) (Replaced with onboard RAM in CD systems) |
| $C00000 | $C1FFFF/$CFFFFF | 128KiB/512KiB | BIOSROM | System's BIOS (size depends on system: 128kB mirrored or 512kB) |
| $D00000 | $DFFFFF | 64KiB (Mirrored) | 64KiB battery-backed RAM (MVS only) | |
| $E00000 | $EFFFFF | 1MiB | UPLOAD | Upload zone (only on CD systems) |
| $FF0000 | $FFFFFF ? | CD system registers |