Palette Index Register
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Revision as of 23:27, 6 January 2019 by wiki>Ped7g (Making the description a bit more detailed.)
| Number | $40 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Chooses an ULANext palette index to configure. |
Palette indices 0-127 are INK colours. Entries 0-7 are the standard Spectrum INK colours (except full ink colour mode, when all 0-255 indices are INK colour).
Palette indices 128-255 are PAPER colours. Entries 128-135 are the standard Spectrum PAPER colours and BORDER colours (even in "full INK" mode).
Higher colours can only be used by enabling ULANext mode via Enhanced ULA Control Register ($43). The split of attribute bits between INK and PAPER values is selected by INK-mask set via Enhanced ULA Ink Color Mask ($42).
Layer 2, Sprite and LoRes palettes work as "full ink" always, INK/PAPER concept does apply only to Enhanced ULA palette.