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	Number	Readable	Writable
I/O Trap Cause	$DA	true	false
I/O Trap Write	$D9	true	true
I/O Traps	$D8	true	true
Internal Port Decoding b0-7 Register	$82	true	true
Internal Port Decoding b16-23 Register	$84	true	true
Internal Port Decoding b24-31 Register	$85	true	true
Internal Port Decoding b8-15 Register	$83	true	true
Interrupt Control	$C0	true	true
Interrupt Enable 0	$C4	true	true
Interrupt Enable 1	$C5	true	true
Interrupt Enable 2	$C6	true	true
Interrupt Status 0	$C8	true	true
Interrupt Status 1	$C9	true	true
Interrupt Status 2	$CA	true	true
Joystick I/O Mode	$0B	true	true
Keymap High Address Register	$28	true	true
Keymap High Data Register	$2A	false	true
Keymap Low Address Register	$29	false	true
Keymap Low Data Register	$2B	false	true
Layer 2 Control Register	$70	true	true
Layer 2 RAM Page Register	$12	true	true
Layer 2 RAM Shadow Page Register	$13	true	true
Layer 2 X Offset MSB Register	$71	true	true
Layer 2 X Offset Register	$16	true	true
Layer 2 Y Offset Register	$17	true	true
LoRes Control Register	$6A	true	true
LoRes X Offset Register	$32	true	true
LoRes Y Offset Register	$33	true	true
Machine ID Register	$00	true	false
Machine Type Register	$03	true	true
Memory Mapping Mode	$8F	true	true
Memory Mapping Register	$8E	true	true
Memory management slot 0 bank	$50	true	true
Memory management slot 1 bank	$51	true	true
Memory management slot 2 bank	$52	true	true
Memory management slot 3 bank	$53	true	true
Memory management slot 4 bank	$54	true	true
Memory management slot 5 bank	$55	true	true
Memory management slot 6 bank	$56	true	true
Memory management slot 7 bank	$57	true	true
NMI Return Address LSB	$C2	true	true
NMI Return Address MSB	$C3	true	true
Next Reset Register	$02	true	true
Palette Index Register	$40	true	true
Palette Value Register	$41	true	true
Peripheral 1 Register	$05	true	true
Peripheral 2 Register	$06	true	true
Peripheral 3 Register	$08	true	true
Peripheral 4 Register	$09	true	true
Peripheral 5 Register	$0A	true	true