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	Number	Readable	Writable	Description
Tilemap Transparency Index Register	$4C	true	true	Index into Tilemap palette (of "transparent" colour).
Transparency colour fallback Register	$4A	true	true	8-bit colour to be used when all layers contain transparent pixel.
ULA Control Register	$68	true	true	Disable ULA, controls ULA mixing/blending, enable ULA+
ULA X Offset Register	$26	true	true	Pixel X offset (0..255) to use when drawing ULA Layer.
ULA Y Offset Register	$27	true	true	Pixel Y offset (0..191) to use when drawing ULA Layer.
User Storage 0 Register	$7F	true	true	8-bit storage for user
Vertical Video Line Offset Register	$64	true	true	Offset numbering of raster lines in copper/interrupt/active register
Video Line Interrupt Control Register	$22	true	true	Controls the timing of raster interrupts and the ULA frame interrupt.
Video Line Interrupt Value Register	$23	true	true	Holds the eight LSBs of the line on which a raster interrupt should occur.
Video Timing Register	$11	true	true	Sets video output timing variant.