676 bytes added,
13:44, 6 October 2018 * Palette index 0 has a mask of &9F (bits for r,g,b and color key), other indices have a mask of 0x01f for just r,g,b.
* If you read from a write-only register you will see data-bus value because the V9990 doesn't assert data on the bus.
* Some registers have additional bits which are not documented. The mask describes which bits are read/write and which are unchanged.
Where the mask has a '1' bit, this bit is read/write. Where the mask has a '0' bit this bit remains at 0 and can't be changed.
- Register 7: Mask is &7F
- Register 9: Mask is &87
- Register 15: Mask is &FF
- Register 22: Mask is &C1
- Register 25: Mask is &CF
- Register 27: Mask is &FF