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	Number	Readable	Writable	Description
Memory management slot 1 bank	$51	Yes	Yes	Selects the 8k-bank stored in 8k-slot 1 (see Memory map).
Memory management slot 2 bank	$52	Yes	Yes	Selects the 8k-bank stored in 8k-slot 2 (see Memory map).
Memory management slot 3 bank	$53	Yes	Yes	Selects the 8k-bank stored in 8k-slot 3 (see Memory map).
Memory management slot 4 bank	$54	Yes	Yes	Selects the 8k-bank stored in 8k-slot 4 (see Memory map).
Memory management slot 5 bank	$55	Yes	Yes	Selects the 8k-bank stored in 8k-slot 5 (see Memory map).
Memory management slot 6 bank	$56	Yes	Yes	Selects the 8k-bank stored in 8k-slot 6 (see Memory map).
Memory management slot 7 bank	$57	Yes	Yes	Selects the 8k-bank stored in 8k-slot 7 (see Memory map).
Copper Data	$60	No	Yes	Used to upload code to the Copper.
Copper Control Low Byte	$61	Yes	Yes	Holds low byte of Copper control bits.
Copper Control High Byte	$62	Yes	Yes	Holds high byte of Copper control flags.
Copper Data 16-bit Write Register	$63	No	Yes	Used to upload code to the Copper.
Vertical Video Line Offset Register	$64	Yes	Yes	Offset numbering of raster lines in copper/interrupt/active register
ULA Control Register	$68	Yes	Yes	Disable ULA, controls ULA mixing/blending, enable ULA+
Display Control 1 Register	$69	Yes	Yes	Layer2, ULA shadow, Timex $FF port
LoRes Control Register	$6A	Yes	Yes	LoRes Radastan mode
Tilemap Control Register	$6B	Yes	Yes	Controls Tilemap mode.
Default Tilemap Attribute Register	$6C	Yes	Yes	Default tile attribute for 8-bit only maps.
Tilemap Base Address Register	$6E	Yes	Yes	Base address of the 40x32 or 80x32 tile map (similar to text-mode of other computers).
Tile Definitions Base Address Register	$6F	Yes	Yes	Base address of the tiles' graphics.
Layer 2 Control Register	$70	Yes	Yes	Layer 2 resolution, palette offset