Transparency colour fallback Register

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Number $4A
Readable Yes
Writable Yes
Short Description 8-bit colour to be used when all layers contain transparent pixel.

Colour format is RRRGGGBB, like Palette Value Register ($41) uses.

Value is 0 (black colour) on reset.

This colour is also used for PAPER and BORDER when ULANext mode is enabled, and "full ink" (ink mask = 255) mode is selected.