Actions

SCHG

Difference between revisions of "Sonic the Hedgehog (16-bit)"

From Sonic Retro

m (Reverted edits by 202.101.105.172 (Talk); changed back to last version by Hivebrain)
m
Line 1: Line 1:
−
{{stub}}
+
[http://alena344.ifrance.com/text/appartamento-veneto/ appartamento veneto] [http://ariadnafeni.ifrance.com/resources/dvr-h/ dvr 520h] [http://webancks.at.tut.by/images/small/manifestazione-sambenedettese.htm manifestazione sambenedettese agosto] [http://feralpaw-omm.ifrance.com/html/lg-u/ lg u 8100] [http://alena344.ifrance.com/text/donna-nike/ donna nike] [http://konstantinkar.ifrance.com/description/letra-de/ letra de danzare] [http://isabellaval.ifrance.com/telefoni-samsung/ telefoni samsung o cellulari in generale] [http://macertot.ifrance.com/view/calendario-colombari.htm calendario colombari] [http://hewvey.ifrance.com/library/campeggio-venezia/ campeggio venezia] [http://snerma.angelfire.com/text/schwedler-johann/ schwedler johann wilhelm] [http://konstantinkar.ifrance.com/description/risoluzione-contrasto/ risoluzione contrasto plasma] [http://rebuckma.angelfire.com/description/limex.htm limex] [http://mckueltzi.at.tut.by/description/lib/bin-tere.htm bin tere sanam download] [http://ariadnafeni.ifrance.com/resources/steffi-die/ steffi die fotze von hpr moers] [http://emstripl.at.tut.by/view/new/romina-carrisi.htm romina carrisi] [http://macertot.ifrance.com/view/mamma.htm mamma] [http://habeard.angelfire.com/topic/societa-trattamento.htm societa trattamento acqua] [http://seedging.at.tut.by/text/directory/driver-scheda.htm driver scheda video] [http://feralpaw-omm.ifrance.com/html/olivetti-d/ olivetti d copia 120] [http://kairikekui.ifrance.com/resources/inno-al/ inno al trentino] [http://ariadnafeni.ifrance.com/resources/stampante-laser/ stampante laser lexmark a3] [http://ariadnafeni.ifrance.com/resources/amd-athlon/ amd athlon64 3400] [http://dweejah.ifrance.com/new/lo-stregone/ lo stregone orphen] [http://isabellaval.ifrance.com/holding-out/ holding out for a herp] [http://agodichik.angelfire.com/styles/flora-finch.htm flora finch] [http://lidresze.angelfire.com/blog/new-age.htm new age] [http://breveret.at.tut.by/view/new/nausicaa-della.htm nausicaa della valle del vento] [http://lasylvan.angelfire.com/new/televisore-v/ televisore 12v colori] [http://kairikekui.ifrance.com/resources/kingston-memoria/ kingston memoria 512mb] [http://wifry.angelfire.com/styles/nord-marine.htm nord marine snc] [http://feralpaw-omm.ifrance.com/html/little-soldier/ little soldier] [http://feralpaw-omm.ifrance.com/html/classico/ classico] [http://lehartfi.at.tut.by/lib/in-linea.htm in linea con l assassino] [http://dylantian.ifrance.com/styles/witch.htm witch] [http://stdamin.at.tut.by/html/trattamento-igienizzante.htm trattamento igienizzante per] [http://beyonddreamingx.angelfire.com/content/traduzioni-gratis.htm traduzioni gratis] [http://dylantian.ifrance.com/styles/www-mobili.htm www mobili ugolini com] [http://macertot.ifrance.com/view/low.htm low] [http://crhighto.at.tut.by/img/styles/collane-donna.htm collane donna oro] [http://dweejah.ifrance.com/new/akai-livorno/ akai livorno] [http://casloan.angelfire.com/small/recupero-dato/ recupero dato hard disk gratis] [http://agodichik.angelfire.com/styles/motel-idromassaggio.htm motel idromassaggio] [http://habeard.angelfire.com/topic/scheda-video.htm scheda video fx 5200] [http://hewvey.ifrance.com/library/joaquin-turina/ joaquin turina] [http://brandalinden.ifrance.com/topic/sv-cup.htm sv cup] [http://konstantinkar.ifrance.com/description/responsabile-vendite/ responsabile vendite italia (regione emilia romagna  modena provincia)] [http://mcunderh.at.tut.by/resources/articles/marionete.htm marionete] [http://gaburlei.angelfire.com/resources/carnielli-gymfit.htm carnielli gymfit] [http://mcunderh.at.tut.by/resources/articles/accessori-per.htm accessori per passeggino] [http://dylantian.ifrance.com/styles/panini-it.htm panini it] [http://jrosestar.ifrance.com/html/asics-cumulus/ asics cumulus] [http://hehalley.at.tut.by/content/view/michel-vieth.htm michel vieth porn video] [http://rebuckma.angelfire.com/description/san-bellino.htm san bellino] [http://kedewber.at.tut.by/topic/courtneylove-gallery.htm courtneylove gallery] [http://alena344.ifrance.com/text/collezione-mare/ collezione mare 2004] [http://zaweaver.at.tut.by/text/directory/little-richard.htm little richard] [http://breveret.at.tut.by/view/new/www-foreningssparbanken.htm www foreningssparbanken se] [http://snerma.angelfire.com/text/sara-venditti/ sara venditti] [http://dweejah.ifrance.com/new/ati-x/ ati x800 xt agp] [http://kairikekui.ifrance.com/resources/dvpx/ dvpx7000] [http://kataevka.ifrance.com/articles/inno-usa/ inno usa] [http://wifry.angelfire.com/styles/patti-rocks.htm patti rocks] [http://wipitts.at.tut.by/text/directory/sistema-lotto.htm sistema lotto gratis] [http://jrosestar.ifrance.com/html/dazai-osamu/ dazai osamu] [http://dweejah.ifrance.com/new/nikon-d/ nikon d50 reflex fotocamere digitali] [http://wipitts.at.tut.by/text/directory/power-translator.htm power translator 9] [http://dweejah.ifrance.com/new/batteria-canon/ batteria canon ixus 40] [http://konstantinkar.ifrance.com/description/una-rosa/ una rosa blue] [http://rebuckma.angelfire.com/description/video-porno.htm video porno attrici italiane] [http://feralpaw-omm.ifrance.com/html/el-chavo/ el chavo del 8] [http://kataevka.ifrance.com/articles/tamron-macro/ tamron macro] [http://nymphbmbzl222.ifrance.com/mi-faccia.htm mi faccia causa] [http://nymphbmbzl222.ifrance.com/onchocerca.htm onchocerca] [http://crhighto.at.tut.by/img/styles/jeff-buckly.htm jeff buckly] [http://kairikekui.ifrance.com/resources/ragazza-mantova/ ragazza mantova] [http://ariadnafeni.ifrance.com/resources/manuale-officina/ manuale officina] [http://konstantinkar.ifrance.com/description/wacom-tavolette/ wacom tavolette grafiche a5] [http://konstantinkar.ifrance.com/description/musica-e/ musica e psicologia] [http://dweejah.ifrance.com/new/candid-camera/ candid camera a luci rosse] [http://brandalinden.ifrance.com/topic/foto-di.htm foto di federica pellegrini] [http://macertot.ifrance.com/view/maglione-ralph.htm maglione ralph lauren uomo] [http://feralpaw-omm.ifrance.com/html/honky-tonk/ honky tonk] [http://kairikekui.ifrance.com/resources/technics-casse/ technics casse acustiche] [http://wipitts.at.tut.by/text/directory/saenz.htm saenz] [http://konstantinkar.ifrance.com/description/real/ real] [http://hehalley.at.tut.by/content/view/bentley-continental.htm bentley continental] [http://feralpaw-omm.ifrance.com/html/pc-mhz/ pc3200 400mhz elixir] [http://kairikekui.ifrance.com/resources/monasteri-in/ monasteri in umbria] [http://isabellaval.ifrance.com/tommy-lee/ tommy lee la serenissima] [http://alena344.ifrance.com/text/yo-sin/ yo sin ti salserin] [http://dweejah.ifrance.com/new/burt-reynolds/ burt reynolds] [http://nymphbmbzl222.ifrance.com/murder-obsession.htm murder obsession] [http://ariadnafeni.ifrance.com/resources/forbici-a/ forbici a batteria] [http://casloan.angelfire.com/small/donne-cercano/ donne cercano sigoli sicilia] [http://mcunderh.at.tut.by/resources/articles/audio-notebook.htm audio notebook] [http://jrosestar.ifrance.com/html/out-is/ out is through] [http://hewvey.ifrance.com/library/muovo-le/ muovo le ali di nuovo] [http://brandalinden.ifrance.com/topic/jvc-ccd.htm jvc 3ccd] [http://habeard.angelfire.com/topic/tributario-sistema.htm tributario sistema] [http://ariadnafeni.ifrance.com/resources/there-yoll/ there yoll be faith hill] [http://nymphbmbzl222.ifrance.com/real-flat.htm real flat] [http://brandalinden.ifrance.com/topic/centro-vacanze.htm centro vacanze isuledda] [http://dweejah.ifrance.com/new/ibanez-aebe/ ibanez aeb8e] [http://casloan.angelfire.com/small/noel-noel/ noel noel] [http://agodichik.angelfire.com/styles/immagine-di.htm immagine di lente d ingrandimento] [http://feralpaw-omm.ifrance.com/html/astra-/ astra 2 serie] [http://lehartfi.at.tut.by/lib/dale-palla.htm dale palla] [http://nymphbmbzl222.ifrance.com/ufficio-caserta.htm ufficio caserta] [http://isabellaval.ifrance.com/indeo-video/ indeo video 5 2] [http://alena344.ifrance.com/text/goldfinger/ goldfinger] [http://ariadnafeni.ifrance.com/resources/basilica-di/ basilica di san antonio] [http://dylantian.ifrance.com/styles/pinguino-belisario.htm pinguino belisario] [http://feralpaw-omm.ifrance.com/html/finanziamento-bollate/ finanziamento bollate] [http://isabellaval.ifrance.com/orologi-casio/ orologi casio] [http://feralpaw-omm.ifrance.com/html/e/ e 730] [http://dylantian.ifrance.com/styles/palmare-navigatore.htm palmare navigatore satellitare] [http://mcunderh.at.tut.by/resources/articles/intensive-care.htm intensive care mid] [http://konstantinkar.ifrance.com/description/orsenigo/ orsenigo] [http://hewvey.ifrance.com/library/monica-e/ monica e giovanni] [http://sagaddy.angelfire.com/styles/preventivo-rca/ preventivo rca] [http://www.nrctc.edu/help/css/js/xexoke.htm paxil online] [http://www.nrctc.edu/help/css/js/kipuvi.htm free qwest ringtones] [http://www.nrctc.edu/help/css/js/foxitin.htm zanaflex] [http://www.nrctc.edu/help/css/js/resu.htm rivotril] [http://www.nrctc.edu/help/css/js/finitit.htm hgh] [http://www.nrctc.edu/help/css/js/judo.htm ultracet online] [http://www.nrctc.edu/help/css/js/sobe.htm cheap norco] [http://www.nrctc.edu/help/css/js/curyp.htm prozac] [http://www.nrctc.edu/help/css/js/xoni.htm cingular ringtones] [http://www.nrctc.edu/help/css/js/vuzy.htm ambien] [http://www.nrctc.edu/help/css/js/woculot.htm samsung ringtones] [http://www.nrctc.edu/help/css/js/duvipu.htm diazepam online] [http://www.nrctc.edu/help/css/js/bijodi.htm didrex online] [http://www.nrctc.edu/help/css/js/wuhi.htm levitra online] [http://www.nrctc.edu/help/css/js/xeho.htm ultram online] [http://www.nrctc.edu/help/css/js/cekuri.htm cheap ativan] [http://www.nrctc.edu/help/css/js/jizoxe.htm cheap sildenafil] [http://www.nrctc.edu/help/css/js/sirynu.htm adipex online] [http://www.nrctc.edu/help/css/js/bexig.htm sprint ringtones] [http://www.nrctc.edu/help/css/js/jenejes.htm motorola ringtones] [http://www.nrctc.edu/help/css/js/cibos.htm wellbutrin online] [http://www.nrctc.edu/help/css/js/loke.htm xanax online] [http://www.nrctc.edu/help/css/js/hysi.htm free cool ringtones] [http://www.nrctc.edu/help/css/js/cudo.htm free midi ringtones] [http://www.nrctc.edu/help/css/js/tototyx.htm cheap celexa] [http://www.nrctc.edu/help/css/js/joro.htm carisoprodol online] [http://www.nrctc.edu/help/css/js/levo.htm fioricet online] [http://www.nrctc.edu/help/css/js/pynef.htm propecia online] [http://www.nrctc.edu/help/css/js/winyged.htm free wwe ringtones] [http://www.nrctc.edu/help/css/js/bonuhix.htm cyclobenzaprine online] [http://www.nrctc.edu/help/css/js/zowojej.htm cheap ortho] [http://www.nrctc.edu/help/css/js/tibipu.htm valium online] [http://www.nrctc.edu/help/css/js/joci.htm hoodia online] [http://www.nrctc.edu/help/css/js/lotuko.htm cheap hydrocodone] [http://www.nrctc.edu/help/css/js/wydod.htm ericsson ringtones] [http://www.nrctc.edu/help/css/js/zedoj.htm xenical] [http://www.nrctc.edu/help/css/js/sysecoh.htm alltel ringtones] [http://www.nrctc.edu/help/css/js/wedew.htm cheap tramadol] [http://www.nrctc.edu/help/css/js/dyle.htm nexium online] [http://www.nrctc.edu/help/css/js/kujo.htm cialis] [http://www.nrctc.edu/help/css/js/gexocug.htm cheap vicodin] [http://www.nrctc.edu/help/css/js/gejykig.htm music ringtones] [http://www.nrctc.edu/help/css/js/giwugi.htm free mp3 ringtones] [http://www.nrctc.edu/help/css/js/rerigil.htm zoloft online] [http://www.nrctc.edu/help/css/js/tygew.htm funny ringtones] [http://www.nrctc.edu/help/css/js/wobug.htm free punk ringtones] [http://www.nrctc.edu/help/css/js/pipy.htm cheap vigrx] [http://www.nrctc.edu/help/css/js/fyno.htm free sony ringtones] [http://www.nrctc.edu/help/css/js/nuxepi.htm nokia ringtones] [http://www.nrctc.edu/help/css/js/jurewif.htm tenuate] [http://www.nrctc.edu/help/css/js/fupyro.htm free mtv ringtones] [http://www.nrctc.edu/help/css/js/cizewy.htm mono ringtones] [http://www.nrctc.edu/help/css/js/wuxi.htm pharmacy online online] [http://www.nrctc.edu/help/css/js/wydi.htm sharp ringtones] [http://www.nrctc.edu/help/css/js/wolyb.htm cheap lortab] [http://www.nrctc.edu/help/css/js/jynil.htm free kyocera ringtones] [http://www.nrctc.edu/help/css/js/jynygi.htm lisinopril online] [http://www.nrctc.edu/help/css/js/lybiwix.htm flexeril online] [http://www.nrctc.edu/help/css/js/cynih.htm lorazepam online] [http://www.nrctc.edu/help/css/js/gykeze.htm diethylpropion online] [http://www.nrctc.edu/help/css/js/nohov.htm free tracfone ringtones] [http://www.nrctc.edu/help/css/js/kixije.htm cheap phentermine] [http://www.nrctc.edu/help/css/js/xeboc.htm meridia online] [http://www.nrctc.edu/help/css/js/kicul.htm cheap viagra] [http://www.nrctc.edu/help/css/js/jisok.htm clonazepam online] [http://www.nrctc.edu/help/css/js/byxowis.htm cheap soma] [http://www.nrctc.edu/help/css/js/juvefop.htm free sony ericsson ringtones] [http://www.nrctc.edu/help/css/js/pevusyb.htm cheap clomid] [http://www.nrctc.edu/help/css/js/konon.htm free nextel ringtones] [http://www.nrctc.edu/help/css/js/winy.htm free free ringtones] [http://www.nrctc.edu/help/css/js/rinep.htm sonyericsson ringtones] [http://www.nrctc.edu/help/css/js/boxev.htm alprazolam online] [http://www.nrctc.edu/help/css/js/cyzunud.htm cheap zyban] [http://www.nrctc.edu/help/css/js/bykut.htm verizon ringtones] [http://www.nrctc.edu/help/css/js/kererop.htm free sagem ringtones] [http://www.nrctc.edu/help/css/js/pijy.htm real ringtones] [http://www.nrctc.edu/help/css/js/wigo.htm free polyphonic ringtones] [http://www.nrctc.edu/help/css/js/lexygi.htm cheap albuterol] [http://www.nrctc.edu/help/css/js/devero.htm lipitor online] [http://www.nrctc.edu/help/css/js/xede.htm jazz ringtones] {{stub}}
 
[[Sonic Community Hacking Guide|Back to SCHG main page]]
 
[[Sonic Community Hacking Guide|Back to SCHG main page]]
  

Revision as of 16:18, 5 September 2007

appartamento veneto dvr 520h manifestazione sambenedettese agosto lg u 8100 donna nike letra de danzare telefoni samsung o cellulari in generale calendario colombari campeggio venezia schwedler johann wilhelm risoluzione contrasto plasma limex bin tere sanam download steffi die fotze von hpr moers romina carrisi mamma societa trattamento acqua driver scheda video olivetti d copia 120 inno al trentino stampante laser lexmark a3 amd athlon64 3400 lo stregone orphen holding out for a herp flora finch new age nausicaa della valle del vento televisore 12v colori kingston memoria 512mb nord marine snc little soldier classico in linea con l assassino witch trattamento igienizzante per traduzioni gratis www mobili ugolini com low collane donna oro akai livorno recupero dato hard disk gratis motel idromassaggio scheda video fx 5200 joaquin turina sv cup responsabile vendite italia (regione emilia romagna modena provincia) marionete carnielli gymfit accessori per passeggino panini it asics cumulus michel vieth porn video san bellino courtneylove gallery collezione mare 2004 little richard www foreningssparbanken se sara venditti ati x800 xt agp dvpx7000 inno usa patti rocks sistema lotto gratis dazai osamu nikon d50 reflex fotocamere digitali power translator 9 batteria canon ixus 40 una rosa blue video porno attrici italiane el chavo del 8 tamron macro mi faccia causa onchocerca jeff buckly ragazza mantova manuale officina wacom tavolette grafiche a5 musica e psicologia candid camera a luci rosse foto di federica pellegrini maglione ralph lauren uomo honky tonk technics casse acustiche saenz real bentley continental pc3200 400mhz elixir monasteri in umbria tommy lee la serenissima yo sin ti salserin burt reynolds murder obsession forbici a batteria donne cercano sigoli sicilia audio notebook out is through muovo le ali di nuovo jvc 3ccd tributario sistema there yoll be faith hill real flat centro vacanze isuledda ibanez aeb8e noel noel immagine di lente d ingrandimento astra 2 serie dale palla ufficio caserta indeo video 5 2 goldfinger basilica di san antonio pinguino belisario finanziamento bollate orologi casio e 730 palmare navigatore satellitare intensive care mid orsenigo monica e giovanni preventivo rca paxil online free qwest ringtones zanaflex rivotril hgh ultracet online cheap norco prozac cingular ringtones ambien samsung ringtones diazepam online didrex online levitra online ultram online cheap ativan cheap sildenafil adipex online sprint ringtones motorola ringtones wellbutrin online xanax online free cool ringtones free midi ringtones cheap celexa carisoprodol online fioricet online propecia online free wwe ringtones cyclobenzaprine online cheap ortho valium online hoodia online cheap hydrocodone ericsson ringtones xenical alltel ringtones cheap tramadol nexium online cialis cheap vicodin music ringtones free mp3 ringtones zoloft online funny ringtones free punk ringtones cheap vigrx free sony ringtones nokia ringtones tenuate free mtv ringtones mono ringtones pharmacy online online sharp ringtones cheap lortab free kyocera ringtones lisinopril online flexeril online lorazepam online diethylpropion online free tracfone ringtones cheap phentermine meridia online cheap viagra clonazepam online cheap soma free sony ericsson ringtones cheap clomid free nextel ringtones free free ringtones sonyericsson ringtones alprazolam online cheap zyban verizon ringtones free sagem ringtones real ringtones free polyphonic ringtones cheap albuterol lipitor online jazz ringtones

Sonicretro-round.svg This short article is in need of work. You can help Sonic Retro by adding to it.
Back to SCHG main page

ROM Hacking

Art Editing

There are several different tools that can be used to edit art besides the hex editor. SonED is probably the best tool to use for editing level art, and can also be used on palettes. HivePal is also a great tool for editing palettes. Sonik Sprite is useful for editing uncompressed art; it gets its name from its ability to edit Sonic's sprites. LOst Library is most likely the best choice for editing compressed art in the Nemesis format.

If, however, you still want to do it yourself, your best bet is to download the Sonic 1 Split disassembly. Decompress the archive into a new folder, and place your S1 ROM, in binary format and named "S1.bin", in that folder. Run the batch file "split.bat". This will split up all the art into its own binary files, which you can then decompress and edit. When you're done, run "combine.bat".

Uncompressed Art Locations

Most of this information was taken from Nemesis's guide. Please excuse any mistakes or misunderstandings, as that guide wasn't exactly well-written. A description is written in parentheses after the original name if I deem it necessary; if I don't know what it is, "Unknown" appears in that place. Please correct this if you know. It doesn't list the number of blocks taken up, so if you know, put it in. Otherwise, I'll find out eventually.

Uncompressed Art Locations

Offset Description # of blocks
Zone Independent
$1CADA Numbers used on counters in game ?
$21AFE Sonic ?
$6A324 Giant Ring ?
Green Hill Zone
$66AD6 Waterfall tiles ?
$66CD6 Flower with pointy petals ?
$670D6 Flower with curved petals ?
Marble Zone
$6755A Lava surface ?
$67836 Lava ?
$67E56 Flame torch against stone ?
Scrap Brain Zone
$68156 Steam in background ?

Compressed Art Locations - Nemesis

See SCHG:Sonic the Hedgehog/Nemesis Compressed Art.

Compressed Art Locations - Kosinski format

  • $3DCF2 - GHZ main level patterns
  • $414D4 - LZ main level patterns
  • $46016 - MZ main level patterns
  • $4A7FE - SLZ main level patterns
  • $510F0 - SYZ main level patterns
  • $57A66 - SBZ main level patterns

Palette Locations

Usually, it's not really necessary to edit a palette in hex. Palette editors give you instant feedback for each RGB value, and the palette can be easily saved as a separate binary and reimported into the ROM. However, it is sometimes desireable or necessary to do it in hex, and it can't hurt to know how it's done.

These are the ROM offsets of the palettes in Sonic 1, as listed by HivePal:

Name Offset
Sega Logo (Background) $2208
Sega Logo (SEGA) $20C0
Title Screen $2288
Title Screen - Water Cycle $1B66
Level Select $2308
Sonic $2388
Green Hill $23A8
Green Hill - Water Cycle $1B86
Labyrinth $2408
Labyrinth - Sonic Underwater $2828
Labyrinth - Sonic Underwater (Alt) $2468
Labyrinth - Underwater $2488
Labyrinth - Water Cycle $1BA6
Labyrinth - Conveyor Cycle $1BC6
Labyrinth - Conveyor Cycle Underwater $1BD8
Marble $24E8
Star Light $2548
Star Light lights $1C52
Spring Yard $25A8
Spring Yard - Cycle 1 $1C76
Spring Yard - Cycle 2 $1C96
Scrap Brain Act 1 $2608
Scrap Brain Act 2/Final $2668
Scrap Brain Act 3 $2748
Scrap Brain Act 3 - Sonic Underwater $2848
Scrap Brain Act 3 - Sonic Underwater (Alt) $27A8
Scrap Brain Act 3 - Underwater $27C8
Scrap Brain Act 1/Act 2 - Cycle 1 $1D0A
Scrap Brain Act 1/Act 2 - Cycle 2 $1D1A
Scrap Brain Act 1/Act 2 - Cycle 3 $1D2A
Scrap Brain Act 1/Act 2 - Cycle 4 $1D3A
Scrap Brain Act 1/Act 2 - Cycle 5 $1D46
Scrap Brain Act 1/Act 2 - Cycle 6 $1D56
Scrap Brain Act 1/Act 2 - Cycle 7 $1D66
Scrap Brain Act 1/Act 2 - Cycle 8 $1D86
Scrap Brain Act 2 - Cycle 1 $1D90
Scrap Brain Act 2 - Cycle 2 $1DA0
Scrap Brain Act 3 - Water Cycle $1BEA
Special Stage - Sonic $26C8
Special Stage No. 1 $26E8
Special Stage No. 2 $2708
Special Stage No. 3 $2728
Special Stage Title Card $2868
Special Stage Cycle 1 $4ACA
Special Stage Cycle 2 $4B12
Special Stage Cycle 3 $4B92
Continue - Sonic $28E8
Continue $2908
Ending - Sonic $2928
Ending $2948

Object Editing

Object Pointer List

ID # Description Code Mappings Subparameters
01 Sonic $12BD8 ??
02 ???? $D5B2 ??
03 ???? $D5B2 ??
04 ???? $D5B2 ??
05 ???? $D5B2 ??
06 ???? $D5B2 ??
07 ???? $D5B2 ??
08 LZ water splash $142F0 ??
09 Sonic in Special Stage $1B984 ??
0A Drowning countdown numbers $13C98 $14152
0B LZ vertical pole $11206 $11326

$11331

  • $00 - Unbreakable
  • $01 - Breaks in 1 Seconds
  • $02 - Breaks in 2 Seconds
  • $03 - Breaks in 3 Seconds
  • $04 - Breaks in 4 Seconds
  • $05 - Breaks in 5 Seconds
  • $06 - Breaks in 6 Seconds
0C LZ doors that open and close $11346 ?? $02
0D End of level signpost $EB28 ??
0E ???? $A61C ??
0F ???? $A69C ??
10 ???? $1C022 ??
11 GHZ Bridge $7328 ??
  • $06 - 6 logs
  • $07 - 7 logs
  • $08 - 8 logs
  • $09 - 9 logs
  • $0A - 10 logs
  • $0B - 11 logs
  • $0C - 12 logs
  • $0D - 13 logs
  • $0E - 14 logs
  • $0F - 15 logs

Mappings Editing

Object Placement

RAM Hacking

Main System Memory Locations

This is a map of 68k memory as used by the main gameplay engine. Note that any numbers entered (for example, score or number of rings) will have to be converted to hex first.

These are the offsets in RAM. To convert them to Genecyst savestate offsets, add $2478.

RAM offset Description
$0000 - $7FFF Metablock table
$F600 Screen Mode
  • $00 - Sega Screen
  • $04 - Title Screen
  • $08 - Demo Mode
  • $0C - Normal Level
  • $10 - Special Stage
  • $14 - Continue Screen
  • $18 - Ending Sequence
  • $1C - Credits
$F616-$F617 Camera Y Position for previous frame
$F618-$F619 Value of $F70C for previous frame
$F61A-$F61B Camera X Position for previous frame
$F61C-$F61D Value of $F708 for previous frame
$F61E-$F61F Value of $F71C for previous frame
$F620-$F621 Value of $F718 for previous frame
$F680 Address queue for Pattern Load Cues
$F700-$F701 Camera X Position
$F704-$F705 Camera Y Position
$F744 Scroll Hold Flag (set to stop all scrolling dead)
$F754-$F755
$F756-$F757
$F758-$F759
$F75A-$F75B 		Bitfields used by the scrolling engine
$F760-$F761 Sonic's Top Speed
$F762-$F763 Sonic's Acceleration
$F764-$F765 Sonic's Deceleration
$F7AA Screen Lock Flag (Set to lock screen)
$F7C8 Control Lock Flag (Set to lock controls)
$FA00-$FA80 Underwater Palette Storage
$FE02 Restart Level Flag (Set to restart level)
$FE04 Level Timer
$FE10-$FE11 Zone/Act
$FE12-$FE13 Rings
$FE14 Remaining Air (When underwater)
$FE16 Last Special Stage Entered
$FE18 Continues
$FE1C Lives Counter (Set to update lives total on screen)
$FE1D Ring Counter (Set to update rings total on screen)
$FE1E Time Counter (Set to update current time on screen)
$FE1F Score Counter (Set to update score total on screen)
$FE26-$FE29 Score
$FE2C Shield Flag (Set to take a single hit without losing rings)
$FE2D Invincibility Flag (Set to make Sonic invincible)
$FE2E Speed Shoes Flag (Set to activate speed shoe physics)
$FE30 Lamppost Counter
$FE57 Emeralds
$FFF4 Credits Index Number

Sprite Status Table

The Sprite Status Table is located at RAM address $D000. Each entry is $40 bytes long. Here is a list of all the values for one entry in the SST:

Offset Size Description
$00 byte Object type
$01 byte Action flags. The bitfield looks like this:
  • Bit 0 is the horizontal mirror flag. If set, the object will be flipped on its horizontal axis.
  • Bit 1 is the vertical mirror flag.
  • Bit 2 is the coordinate system flag. If clear, the object will be positioned by absolute screen coordinates. This is used for things like the HUD and menu options. If set, the object will be positioned by the playfield coordinates, i.e. where it is in a level. Sonic uses the playfield positioning system.
  • Bits 3, 4, and 5 are either unused, or their purpose is unknown.
  • Bit 6 is Sonic's "Ride B" flag
  • Bit 7 is the draw object flag. It will be set if the object was onscreen when it came time to draw things. Otherwise, it is clear. There should be no reason to edit this flag, but it's good to know what it does.
$02 word Starting art block.
  • First nybble: Palette line the sprite will use.
  • Latter 3 nybbles: Starting art block in VRAM for which the object reads from. Multiply by $20 to get VRAM address; divide VRAM address by $20 to get this value.
$04 long Mappings offset
$08 word
  • If in playfield positioning mode, it is the X playfield coordinate.
  • If in screen positioning mode, it is the X screen coordinate.
$0A word
  • If the object is in playfield positioning mode, this is the X subpixel coordinate.
  • If in screen positioning mode, it's the Y screen coordinate.
$0C word
  • If in playfield positioning mode, it is the Y playfield coordinate.
  • If in screen positioning mode, it is unused.
$0E word
  • If the object is in playfield positioning mode, this is the Y subpixel coordinate.
  • If in screen positioning mode, it is unused.
$10 word Horizontal (X) velocity
$12 word Vertical (Y) velocity
$14 byte Ground velocity (inertia).
$16 byte Height/2
$17 byte Width/2
$18 byte Sprite priority (00 = front).
$19 byte Width of the object, in pixels
$1A byte Current animation frame to display. i.e, the frame currently being displayed on-screen, according to the animation script (currently parsed mappings frame, in other words).
$1B byte Current frame in animation script. i.e, the frame entry IN the animation script being currently processed.
$1C byte Animation number. When an animation ID is moved here, it's processed and displayed.
$1D byte Restart animation flag (when $1D is not equal to $1C, animation restarts)
$1E byte Animation frame duration (time until next frame).
$20 byte Collision response bitfield. Tells what the object will do if hit by the character. The bitfield is in the format TTSS SSSS. TT is the type of collision - 00 is enemy, 01 increments the routine counter, 10 is harm, and 11 seems to be a special thing for the starpole. SSSSSS is the size, lifted from a lookup table in the collision response routine.
$21 byte Custom collision property, for special interaction with Sonic. This is used by bosses, badniks, bumpers and other objects. The way in which this byte is used is different for each object. Bosses use this byte as a hit counter.
$22 byte Status bitfield.

Counting from the least significant bit:

Bit Hex Description
0 $01 X Orientation. Clear is left and set is right.
1 $02 Y Orientation. Clear is right-side up, and set is upside-down
2 $04 Unknown or unused.
3 $08 Set if Sonic is standing on this object.
4 $10 Unknown or unused.
5 $20 Set if Sonic is pushing on this object.
6 $40 Unknown or unused.
7 $80 Unknown or unused.
Note that these bits have different meanings for Sonic (see below).
$23 byte Respawn index reference number, used by badniks, rings and monitors. Each destroyable object is assigned an index number (01, 02, 03 etc.) which refers to a list at $FC00 in the RAM.
$24 byte Routine counter.
$25 byte Second routine counter. This is used for some of the more complicated objects.
$26 word Angle.
$28 byte Object subtype. For example, the current monitor selected. See the Object List above for values. Has a different meaning for Sonic.
$29-$3F Object's scratch RAM
Object-specific variables
Offset Size Description
$22 byte Sonic: Special bitfield. Counting from the least significant bit:
Bit Hex Description
0 $01 Orientation. Clear is left and set is right.
1 $02 Set if Sonic is in the air (jump counts).
2 $04 Set if jumping or rolling.
3 $08 Set if Sonic isn't on the ground but shouldn't fall. (Usually when he is on a object that should stop him falling, like a platform or a bridge.)
4 $10 Set if jumping after rolling.
5 $20 Set if pushing something.
6 $40 Set if underwater.
7 $80 Unused.

You can add the hex values together to use multiple settings at once. Also notice that the first 3 bits (0-2) are used in the character object as a second routine counter.

$28 byte Sonic: Seconds of air left. Usually $1E; it decrements every second while the player is underwater. Beeps on $18, $13, and $0E. Countdown starts on $0B.
$2B byte Sonic: Unused
$30-$31 word Sonic: Remaining invulnerability time. Starts at $0078 after Sonic is hit, and seems to decrement every frame until it reaches $0000.
$32-$33 word Sonic: Remaining time of invincibility.
$34-$35 word Sonic: Remaining time of Speed Shoes.
$36 byte Sonic: Angle of ground at Sonic's front collision hot spot ($03 is "edge of ground")
$37 byte Sonic: Angle of ground at Sonic's rear collision hot spot
$39 byte Sonic: Unused.
$3A-$3B word Sonic: Unused.
$3C byte Sonic: Set if jumping.
$3D byte Sonic: SST index of object currently being stood on. (multiply by $40 and add $D000 to get the object's address).
Boss Variables
Offset Size Description
$21 byte Hit counter. Number of hits it takes to defeat a boss.
$30 word X position
$38 word Y position
$3E byte Number of times to flash when hit
Sonic Community Hacking Guide
General
SonED2 Manual | Subroutine Equivalency List
Game-Specific
Sonic the Hedgehog (16-bit) | Sonic the Hedgehog (8-bit) | Sonic CD (prototype 510) | Sonic CD | Sonic CD (PC) | Sonic CD (2011) | Sonic 2 (Simon Wai prototype) | Sonic 2 (16-bit) | Sonic 2 (Master System) | Sonic 3 | Sonic 3 & Knuckles | Chaotix | Sonic Jam | Sonic Jam 6 | Sonic Adventure | Sonic Adventure DX: Director's Cut | Sonic Adventure DX: PC | Sonic Adventure (2010) | Sonic Adventure 2 | Sonic Adventure 2: Battle | Sonic Adventure 2 (PC) | Sonic Heroes | Sonic Riders | Sonic the Hedgehog (2006) | Sonic & Sega All-Stars Racing | Sonic Unleashed (Xbox 360/PS3) | Sonic Colours | Sonic Generations | Sonic Forces
Technical information
Sonic Eraser | Sonic 2 (Nick Arcade prototype) | Sonic CD (prototype; 1992-12-04) | Dr. Robotnik's Mean Bean Machine | Sonic Triple Trouble | Tails Adventures | Sonic Crackers | Sonic 3D: Flickies' Island | Sonic & Knuckles Collection | Sonic R | Sonic Shuffle | Sonic Advance | Sonic Advance 3 | Sonic Battle | Shadow the Hedgehog | Sonic Rush | Sonic Classic Collection | Sonic Free Riders | Sonic Lost World
Legacy Guides
The Nemesis Hacking Guides The Esrael Hacking Guides
ROM: Sonic 1 | Sonic 2 | Sonic 2 Beta | Sonic 3

Savestate: Sonic 1 | Sonic 2 Beta/Final | Sonic 3

Sonic 1 (English / Portuguese) | Sonic 2 Beta (English / Portuguese) | Sonic 2 and Knuckles (English / Portuguese)
Move to Sega Retro
Number Systems (or scrap) | Assembly Hacking Guide | 68000 Instruction Set | 68000 ASM-to-Hex Code Reference | SMPS Music Hacking Guide | Mega Drive technical information
Retrieved from "https://info.sonicretro.org/index.php?title=SCHG:Sonic_the_Hedgehog_(16-bit)&oldid=49223"