All registers are r/w unless otherwise noted

$C000	Keyboard Register (r), 80STORE off (w)
$C001	80STORE on
$C002	AUXRD off
$C003	AUXRD on
$C004	AUXWRT off
$C005	AUXWRT on
$C006	CXROM off
$C007	CXROM on
$C008	AUXZP off
$C009	AUXZP on
$C00A	C3ROM off
$C00B	C3ROM on
$C00C	80COL off (w)
$C00D	80COL on (w)
$C00E	ALTCH off (w)
$C00F	ALTCH on (w)
$C010	Clear keyboard strobe
$C011	Read LCBANK2 as bit 7
$C012	Read LCRAM as bit 7
$C013	Read AUXRD as bit 7
$C014	Read AUXWR as bit 7
$C015	Read CXROM as bit 7
$C016	Read ALTZP as bit 7
$C017	Read C3ROM as bit 7
$C018	Read 80STORE as bit 7
$C019	VBL register (bit 7 = high during VBL)
$C01A	Read TEXT as bit 7
$C01B	Read MIXED as bit 7
$C01C	Read PAGE2 as bit 7
$C01D	Read HIRES as bit 7
$C01E	Read ALTCH as bit 7
$C01F	Read 80COL as bit 7
$C020	Cassette Out
$C021
$C022	Text Color Register (low nibble = background, high nibble = foreground)
$C023
$C024
$C025	Key Modifiers Register
$C026	NEED THIS INFO BADLY!
$C027	NEED THIS INFO BADLY!
$C028
$C029	New Video Register (bit 5 = monochrome video bit)
$C02A
$C02B
$C02C
$C02D	Slot Register
$C02E	Mega II Vertical Counter bits 1-8
$C02F	Mega II Horizontal counter bits 0-5 and Vertical Counter Bit 0
$C030	Speaker
$C031
$C032
$C033	Clock Chip Data Register
$C034	Clock Chip Control Register / Border Color
$C035	Shadow Register
		bit 0: Set to disable shadowing standard bank $00/$01 video to banks $E0/$E1
		bit 1:
		bit 2:
		bit 3: Set to disable shadowing bank $01 superhires screen to bank $E1
		bit 4:
		bit 5:
		bit 6: Set to disable shadowing bank $00/$01 page $Cx locations to banks $E0/$E1
		bit 7:
$C036	CYA Register
$C037	DMA Bank Address Register
$C038	SCC B Command Register
$C039	SCC A Command Register
$C03A	SCC B Data Register
$C03B	SCC A Data Register
$C03C
$C03D
$C03E
$C03F
$C040
$C041	Interrupt Enable Register
$C042
$C043
$C044
$C045
$C046
$C047	Clear VBL interrupt
$C048
$C049
$C04A
$C04B
$C04C
$C04D
$C04E
$C04F
$C050	TEXT off
$C051	TEXT on
$C052	MIXED off
$C053	MIXED on
$C054	PAGE2 off
$C055	PAGE2 on
$C056	HIRES off
$C057	HIRES on
$C058	AN0 on
$C059	AN0 off
$C05A	AN1 on
$C05B	AN1 off
$C05C	AN2 on
$C05D	AN2 off
$C05E	AN3 on
$C05F	AN3 off
$C060	Cassette In
$C061	Button 0 (bit 7 = high when pressed) [ aka Command key ]
$C062	Button 1 (bit 7 = high when pressed) [ aka Option key ]
$C063	Button 2 (bit 7 = high when pressed)
$C064	Paddle 0 (bit 7 = high when timer expires)
$C065	Paddle 1 (bit 7 = high when timer expires)
$C066	Paddle 2 (bit 7 = high when timer expires)
$C067	Paddle 3 (bit 7 = high when timer expires)
$C068	State Register
$C069
$C06A
$C06B
$C06C
$C06D
$C06E
$C06F
$C070	Paddle Trigger
$C072
$C073
$C074
$C075
$C076
$C077
$C078
$C079
$C07A
$C07B
$C07C
$C07D
$C07E
$C07F
$C080	Read LC bank 2, write protect LC RAM
$C081	Read ROM, and second read write-enables LC RAM
$C082	Read ROM, write protect LC RAM
$C083	Read LC bank 2, and second read write-enables LC RAM
$C084	Same as $C080
$C085	Same as $C081
$C086	Same as $C082
$C087	Same as $C083
$C088	Read LC bank 1, write protect LC RAM
$C089	Read ROM, and second read write-enables LC RAM
$C08A	Read ROM, write protect LC RAM
$C08B	Read LC bank 1, and second read write-enables LC RAM
$C08C	Same as $C088
$C08D	Same as $C089
$C08E	Same as $C08A
$C08F	Same as $C08B
$C090
  |
$C09F	Slot 1 Access
$C0A0
  |
$C0AF	Slot 2 Access
$C0B0
  |
$C0BF	Slot 3 Access
$C0C0
  |
$C0CF	Slot 4 Access
$C0D0
  |
$C0DF	Slot 5 Access
$C0E0
  |
$C0EF	Slot 6 Access
$C0F0
  |
$C0FF	Slot 7 Access