Sprite port-mirror Attribute 3 Register
From SpecNext official Wiki
| Number | $38 |
|---|---|
| Readable | No |
| Writable | Yes |
| Short Description | Nextreg port-mirror to write directly into "byte 4" of Sprite Attribute Upload ($xx57 / 87). |
Byte 4 is bitmapped:
| Bit | Description |
|---|---|
| 7 | Enable visibility |
| 6 | Enable fifth sprite attribute byte |
| 5-0 | Pattern index ("Name") |
When the bit 6 is "0", the sprite renderer will ignore value written in fifth attribute byte, for example by Sprite port-mirror Attribute 4 Register ($39), and it will use zero for all the features of fifth attribute byte (it is safe to initialize only four bytes if you are planning to use 4-byte type of sprites).
If you want the value in fifth attribute byte to apply during rendering, bit 6 here must be set to "1".