Sprite Attribute 1 (with INC) Register
From SpecNext Wiki
| Next Register Number | $76 |
|---|---|
| Readable | No |
| Writable | Yes |
| Short Description | Same as NextReg:$36 (write second byte of sprite-attributes), plus increments NextReg:$34 |
Eight low bits of Y position. MSB of Y-pos is in "byte 5".
After write into sprite-attribute "byte 2" ( IO:$xx57), the NextReg:$34 is incremented (with all consequences stemming from such action). If the sprite 127 was modified, the result of the increment is officially "undefined behaviour", and code should explicitly set valid 0..127 sprite index before next sprite-attribute manipulation.