| Address | Use |
| $000000-$07FFFF | Chip RAM |
| $080000-$1FFFFF | Reserved |
| $200000-$9FFFFF | Potential Fast-RAM |
| $A00000-$BEFFFF | Reserved |
| $BFD000-$BFDF00 | PIA B (even addresses) |
| $BFE001-$BFEF00 | PIA C (odd addresses) |
| $C00000-$DFEFFF | Reserved for expansion |
| $DFF000-$DFFFFF | Custom chip registers |
| $E00000-$E7FFFF | Reserved |
| $E80000-$EFFFFF | Expansion ports |
| $F00000-$F7FFFF | Reserved |
| $F80000-$FFFFFF | System ROM |