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Sonic the Hedgehog 2 (Sega Master System)/RAM map
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The following article is a RAM map for Sonic the Hedgehog 2 (Sega Master System).
RAM Map
Addr Size Description ---- ---- ----------- C000 4096 Level Layout D12B 1 Bank number D12C 1 Level select flag (Change to 0D) D137 16 Button pressed & held D162 1 8x8 -> 32x32 mappings ROM bank D163 1 level layout ROM bank D164 2 8X8 -> 32X32 mappings pointer D166 2 Level layout pointer D168 2 ??? (affects level, part of Level Header) D16A 2 Collision data? D16C 2 Level width in tiles D16E 2 Level height in tiles D172 1 BG X Scroll D173 1 BG Y Scroll D174 2 Sonic X position D176 2 Sonic Y position D278 2 Camera position X&Y 32x32? D27C 2 Fixed camera height? D27E 2 Camera height in pixels? D280 2 Fixed camera width? D282 2 Camera Width in pixels? D284 2 Camera X position D286 2 Camera Y position D288 1 Camera offset X D289 1 Camera offset Y D293 1 Pause flag D295 1 Zone D296 1 Act D297 1 Lives you started the act with D298 1 Lives D299 1 Rings D29B 4 Score 1 D29F 4 Score 2 D2A2 3 Time bonus D2B9 2 Timer digits D2BC 1 Time milliseconds D2BD 1 Continues (turns first value into 8 after using 1) D2C2 1 Act on Level Select D2C3 2 Continue timer D2C5 1 Chaos Emeralds D2C6 1 Chaos Emerald collected D2D4 2 Collision pointer D2D6 1 Frames? D2D7 1 Demo number D2D8 1 Demo data bank D2D9 2 Demo location D34F 1 Animation frames for Sonic D351 1 Ring frames D395 2 Ring art location D3A8 1 Lost rings trigger D3A9 1 Invincibility blinking frames timer D3AA 1 Timer for holding jump up (counts up when jump is held in air, sets to 20 if jump is let go) D3B4 2 Timer for stalling D3BA 2 Title card timer after ZONE D467 1 Underwater flag D468 1 Time spent underwater in milliseconds D469 1 Time spent underwater in longer seconds D4A0 1 Invincibility timer D4A6 4 Palette cycle D4C6 32 Palette | D4D3 Auto palette D4E6 4 Load level/Sonic palette flags D502 1 Current state D506 1 Sonic sprite D511 2 Sonic X physical position D514 2 Sonic Y physical position D516 2 Horizontal speed D518 2 Jump gravity/Vertical Speed D532 1 Powerup DD00 400 Music | DD04 Music/SFX trigger
Internal Data for Sonic the Hedgehog 2 (Sega Master System)
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