Sprite Attribute 4 Register
From SpecNext Wiki
| Number | TBRegisterNumber::$39 |
|---|---|
| Readable | TBRegisterReadable::No |
| Writable | TBRegisterWritable::Yes |
| Short Description | [[ShortDesc::Nextreg port-mirror to write directly into "byte 5" of {{#ask:
PortNumber::$xx57 }} ($xx57{{#ask: PortNumber::$xx57 |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}).]] |
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 {{#ask: PortNumber::$xx57 }} ($xx57{{#ask: PortNumber::$xx57 |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}) for extra notes about coordinates and clipping.