Sprite port-mirror Attribute 4 Register
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Revision as of 11:08, 24 December 2018 by wiki>Ped7g (Core 2.00.22 changes, and forum knowledge from Jim Bagley distilled.)
| Number | $39 |
|---|---|
| Readable | No |
| Writable | Yes |
| Short Description | Nextreg port-mirror to write directly into "byte 5" of Sprite Attribute Upload ($xx57 / 87). |
Byte 5 is bitmapped:
| Bit | Description |
|---|---|
| 7 | If 1, the pattern will be treated as 4-bit colour one (128 bytes), 0 is for 8-bit colour patterns (256 bytes) |
| 6 | Chooses top/bottom part of pattern slot (for 4-bit colour patterns)
0 will target bytes 0..127 of pattern "Name" (byte 4), 1 will target bytes 128..255 of pattern "Name". |
| 5 | Reserved, use always 0 |
| 4-3 | x-axis scale factor: %00 = 1x (16 pixels), %01 = 2x, %10 = 4x, %11 = 8x (128 pixels) |
| 2-1 | y-axis scale factor: %00 = 1x (16 pixels), %01 = 2x, %10 = 4x, %11 = 8x (128 pixels) |
| 0 | MSB of Y coordinate |
See Sprite Attribute Upload ($xx57 / 87) for extra notes about coordinates and clipping.