Difference between revisions of "Global Transparency Register"

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(Updated information about 1-bit tilemaps.)
 
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This value is 8-bit only, so the transparency is compared only by the MSB bits of the final colour.
 
This value is 8-bit only, so the transparency is compared only by the MSB bits of the final colour.
  
This only affects Layer 2, ULA and LoRes. Sprites use {{NextRegNo|$4B}} for transparency, Tilemap uses {{NextRegNo|$4C}}.
+
This only affects Layer 2, ULA, LoRes and 1-bit ("text mode") tilemap. Sprites use {{NextRegNo|$4B}} for transparency, 4-bit Tilemap uses {{NextRegNo|$4C}}.

Latest revision as of 16:24, 6 September 2020

Number $14
Readable Yes
Writable Yes
Short Description Sets the "transparent" colour for Layer 2, ULA and LoRes pixel data.

Transparency color value (0xE3 after a reset).

This value is 8-bit only, so the transparency is compared only by the MSB bits of the final colour.

This only affects Layer 2, ULA, LoRes and 1-bit ("text mode") tilemap. Sprites use Sprites Transparency Index Register ($4B) for transparency, 4-bit Tilemap uses Tilemap Transparency Index Register ($4C).