Internal ROM

These addresses sourced from here.

Address	Description
0x340AD4	Beginning of room header data
0x75FAE4	Pointer to the scrolling for the first room in the game
0x33E608	Beginning of the door data for the first room in the game
0x345AB6	Block attributes (which weapon breaks which blocks)
0x75FAA8	Pointer to door data for the first room in the game
0x2CCA88	Properties related to Skree
0x2B0EAB	Start of enemy data
0x3654D8	Block properties clipping
0x3655A0	Special Blocks TSA
0x3601D0	Start of door state data(when a door destination is replaced upon a certain event, used when big changes to a room will be made)
0x3459C4	tank quantities for missile, supers, power bombs and energy tanks. Each has 3 entries for the 3 difficulty levels
0x7D80A0 - 0x7F7733	NES Metroid data

Graphics & Palettes

Most of these addresses sourced from here.

Address	Description
0x231C00	Start of Samus Graphics (there's a lot and it's messy)
0x2376A8	Samus Palette
0x32BAC8	Generic Sprite Graphics
0x32BA08	Generic Sprite Palette
0x40E0C4	Minimap Graphics
0x411360	Minimap Palette
0x5D940C	Generic BG Graphics
0x5DFE20	Generic BG Palette
0x75EBF8	Sprite Graphics (Compressed)
0x75EEF0	Sprite Palettes