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	Number	Readable	Writable	Description
Palette Value Register	$41	true	true	Use to set/read 8-bit colours of the ULANext palette.
Enhanced ULA Ink Color Mask	$42	true	true	Specifies mask to extract ink colour from attribute cell value in ULANext mode.
Enhanced ULA Control Register	$43	true	true	Enables or disables Enhanced ULA interpretation of attribute values and toggles active palette.
Enhanced ULA Palette Extension	$44	true	true	Use to set 9-bit (2-byte) colours of the Enhanced ULA palette, or to read second byte of colour.
Transparency colour fallback Register	$4A	true	true	8-bit colour to be used when all layers contain transparent pixel.
Sprites Transparency Index Register	$4B	true	true	Index into sprite palette (of "transparent" colour).
Tilemap Transparency Index Register	$4C	true	true	Index into Tilemap palette (of "transparent" colour).
Memory management slot 0 bank	$50	true	true	Selects the 8k-bank stored in 8k-slot 0 (see Memory map).
Memory management slot 1 bank	$51	true	true	Selects the 8k-bank stored in 8k-slot 1 (see Memory map).
Memory management slot 2 bank	$52	true	true	Selects the 8k-bank stored in 8k-slot 2 (see Memory map).
Memory management slot 3 bank	$53	true	true	Selects the 8k-bank stored in 8k-slot 3 (see Memory map).
Memory management slot 4 bank	$54	true	true	Selects the 8k-bank stored in 8k-slot 4 (see Memory map).
Memory management slot 5 bank	$55	true	true	Selects the 8k-bank stored in 8k-slot 5 (see Memory map).
Memory management slot 6 bank	$56	true	true	Selects the 8k-bank stored in 8k-slot 6 (see Memory map).
Memory management slot 7 bank	$57	true	true	Selects the 8k-bank stored in 8k-slot 7 (see Memory map).
Copper Data	$60	false	true	Used to upload code to the Copper.
Copper Control Low Byte	$61	true	true	Holds low byte of Copper control bits.
Copper Control High Byte	$62	true	true	Holds high byte of Copper control flags.
Copper Data 16-bit Write Register	$63	false	true	Used to upload code to the Copper.
Vertical Video Line Offset Register	$64	true	true	Offset numbering of raster lines in copper/interrupt/active register