Sprite Status/Slot Select
From SpecNext Wiki
| Port Number | $303B |
|---|---|
| Decimal | |
| Short desc. | Selects active sprite slot and palette address, and returns sprite status. |
| Bit Mask | |
| Readable | Yes |
| Writable | Yes |
| Subsystem | Sprites |
Used to select the sprite slot configured by NextPort:$xx57 and NextPort:$xx5B. Also "initializes the address of the palette".