Memory Map
The "official" memory map published by Mattel is included below.
OFFICIAL MEMORY MAP
| Memory Range | Accessibility | Device |
|---|---|---|
| $0000-$003F | RW | STIC Registers |
| $0100-$01EF | RW | RAM 8-bit |
| $01F0-$01FF | RW | PSG Registers |
| $0200-$035F | RW | RAM |
| $1000-$1FFF | R | Executive ROM |
| $3000-$37FF | R | Graphics ROM |
| $3800-$39FF | RW | Graphics RAM |
Note that the official memory map shown above is actually incomplete, due to the fact that the STIC and the Graphics RAM chip did not completely decode addresses that were placed on the address bus.
ADDITIONAL MEMORY ALIASES
| Memory Range | Accessibility | Device |
|---|---|---|
| $3A00-$3BFF | RW | Graphics RAM |
| $3C00-$3DFF | RW | Graphics RAM |
| $3E00-$3FFF | RW | Graphics RAM |
| $4000-$403F | W | STIC Registers |
| $7800-$79FF | W | Graphics RAM |
| $7A00-$7BFF | W | Graphics RAM |
| $7C00-$7DFF | W | Graphics RAM |
| $7E00-$7FFF | W | Graphics RAM |
| $8000-$803F | W | STIC Registers |
| $B800-$B9FF | W | Graphics RAM |
| $BA00-$BBFF | W | Graphics RAM |
| $BC00-$BDFF | W | Graphics RAM |
| $BE00-$BFFF | W | Graphics RAM |
| $C000-$C03F | W | STIC Registers |
| $F800-$F9FF | W | Graphics RAM |
| $FA00-$FBFF | W | Graphics RAM |
| $FC00-$FDFF | W | Graphics RAM |
| $FE00-$FFFF | W | Graphics RAM |
Related Subjects:
Incomplete Address Decoding
