68k memory map
| Start address | End address | DEF Name | Description |
| $000000 | $0FFFFF | First 1MB of 68k ROM | |
| $100000 | $10F2FF | RAMSTART | User RAM |
| $10F2FF | $10F300 | BIOS RAM | |
| $200000 | $2FFFFF | Second 1MB of 68k ROM (pageable) | |
| $300000 | $3FFFFF | Memory mapped registers | |
| $400000 | $403FFF | PALETTERAM | Palette RAM |
| $800000 | $80FFFF ? | MEMORYCARD | Memory card |
| $C00000 | $C20000/$CFFFFF | System's BIOS (size depends: 128kB or 512kB) | |
| $E00000 | $EFFFFF | 1MByte upload zone (only on CD systems) |