Third-Party T-Series Codes

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Sega used T-series codes to identify officially licensed third party developers. ROM headers of games developed by a third party (except those that Sega contracts out, such as Nextech) usually contain a field stating the T-series code. For example, the sixteen bytes at offset $110 (hex) of Sega Mega Drive game ROMs would usually look like one of 

(C)SEGA year.mon
(C)T-xx year.mon
(C)T-xxxyear.mon
(C)Txxx year.mon

Not all third party developers/publishers have followed these rules; for example, Psygnosis, Kaneko, Taito, and Treco have placed their company name in the field on several occasions.

T-Code Developer
T-11 Taito
T-12 Capcom
T-13 Data East
T-14 Namco
T-15 Sunsoft
T-16 Ma-Ba
T-17 Dempa
T-18 Tecno Soft
T-19 Tecno Soft
T-20 Asmik
T-21 ASCII
T-22 Micronet
T-23 VIC Tokai
T-24 Treco/Sammy
T-25 NCS/Masaya
T-26 Sigma Enterprises
T-27 Toho
T-28 HOT-B
T-29 Kyugo
T-30 Video System
T-31 SNK
T-32 Wolf Team
T-33 Kaneko
T-34 DreamWorks
T-35 Toaplan (MUSHA JP), Seismic, Compile
T-36 Tecmo
T-37
T-38 Mediagenic? only found in the ROM header for Fatman, which was published by Sanritsu (T-44)
T-39
T-40 Toaplan
T-41 UNIPACC
T-42 UPL
T-43 Human
T-44 Sanritsu/SIMS
T-45 Game Arts
T-46 Kodansha Research Institute
T-47 Sage's Creation
T-48 Tengen, Time Warner Interactive
T-49 Telenet Japan
T-50 Electronic Arts
T-51 Microcabin
T-52 SystemSoft
T-53 Riverhillsoft
T-54 Face
T-55 Nuvision
T-56 Razorsoft
T-57 Jaleco
T-58 Visco
T-59
T-60 Victor Musical Industries/Victor Entertainment/Victor Soft
T-61 Wonder Amusement Studio
T-62 Sony Imagesoft
T-63 Toshiba EMI
T-64 IGS > Data West
T-65 Tsukuda Ideal (Tsukuda Original (TODO confirm))
T-66 Compile
T-67 Home Data/Magical
T-68 CSK Research Institute (CRI)
T-69 Arena
T-70 Virgin Interactive
T-71 Nihon Bussan (Nichibutsu)
T-72 Varie
T-73 Coconuts Japan, Soft Vision
T-74 PALSOFT
T-75 Pony Canyon
T-76 Koei
T-77 Sur De Wave
T-78
T-79 U.S. Gold
T-80
T-81 Flying Edge/Acclaim
T-82
T-83 GameTek
T-84 GameTek
T-85 PCM Complete
T-86 Absolute Entertainment
T-87 Mindscape/Software Toolworks
T-88 Domark
T-89 Parker Brothers
T-90
T-91 Pack-In-Video/Pack-In-Soft/Victor Soft/Victor Interactive Software
T-92 Sandstorm > Polydor K.K.
T-93 Sony
T-94
T-95 Konami
T-96
T-97 Tradewest/Williams Entertainment/Midway Games
T-98
T-99 Success
T-100 Black Pearl Software/THQ
T-101 TecMagik
T-102
T-103 Takara
T-104
T-105 Shogakukan Production
T-106 Electronic Arts Victor
T-107 Electro Brain
T-108
T-109 Saddleback Graphics
T-110 Dynamix > Simon & Schuster Interactive
T-111 American Laser Games
T-112 Hi-Tech Expressions
T-113 Psygnosis
T-114 T&E Soft
T-115 Core Design
T-116
T-117
T-118 Compton's New Media
T-119 Accolade
T-120 Codemasters
T-121 ReadySoft
T-122
T-123 Gremlin Interactive
T-124 Spectrum Holobyte
T-125 Interplay
T-126 Maxis
T-127 Working Designs
T-128
T-129
T-130 Activision
T-131
T-132 Playmates
T-133 Bandai
T-134
T-135 CapDisc
T-136
T-137 ASC Games
T-138
T-139 Viacom New Media
T-140
T-141 Toei Video
T-142
T-143 Hudson Soft
T-144 Atlus
T-145 Sony Music Entertainment
T-146 Takara
T-147 Sansan
T-148
T-149 Infocom
T-150 Imagineer
T-151 Infogrames
T-152 Davidson & Associates
T-153 Rocket Science Games
T-154 Technos Japan
T-155
T-156
T-157 Angel
T-158 Mindscape
T-159 Crystal Dynamics
T-160 Sales Curve Interactive
T-161 Fox Interactive
T-162 Digital Pictures
T-163
T-164 Ocean
T-165 Seta
T-166 Altron
T-167 ASK Kodansha
T-168 Athena
T-169 Gakken
T-170 General Entertainment (GE)
T-171
T-172 (later EA Sports Mega Drive titles have T-172 serial numbers in their ROM headers...)
T-173
T-174 Glams
T-175
T-176 ASCII Something Good
T-177 Ubisoft
T-178 Hitachi
T-179
T-180 BMG Japan
T-181 Obunsha
T-182 Thinking Cap
T-183
T-184
T-185 Gaga Communications
T-186 Game Bank/Soft Bank
T-187 Naxat Soft > Pionesoft
T-188 Mizuki > Maxbet > Spike, Geo
T-189 KAZe
T-190
T-191
T-192
T-193 Diapet
T-194 We Net
T-195 Datam Polystar
T-196
T-197 KID (Kindle Imagine Develop)
T-198 Epoch/Sakata SAS
T-199 Ving
T-200 Yoshimoto Kogyo
T-201 NEC Interchannel/InterChannel
T-202 Sonnet Computer Entertainment/Varie
T-203 Game Studio
T-204 Psikyo
T-205 Media Entertainment
T-206 Banpresto
T-207 Ecseco Development
T-208 Bullet Proof Software (BPS)/Elorg
T-209 SIEG/PRISM
T-210 Yanoman Games
T-211
T-212 Oz Club
T-213 Nihon Create
T-214 Media Rings
T-215 Shoeisha
T-216 OPeNBooK
T-217 Hamlet/Hakuhodo
T-218 Yumedia (Aroma)
T-219 Societa Daikanyama
T-220 Arc System Works
T-221 Climax Entertainment
T-222 Pioneer LDC
T-223 Tokuma Shoten
T-224 I'MAX
T-225
T-226 Shogakukan
T-227 Vantan International/Electric Dreams/Nayuta
T-228
T-229 Titus
T-230 LucasArts
T-231 Pai
T-232 Ecole > Reindeer
T-233
T-234 Bandai Visual
T-235 Quintet
T-236
T-237
T-238
T-239 Disney Interactive
T-240 9003 > OpenBook9003
T-241 Multisoft/Millenium Interactive
T-242 Sky Think System
T-243 OCC
T-244
T-245
T-246 INCREMENT P (iPC)
T-247
T-248
T-249 King Records
T-250 Fun House
T-251 Patra
T-252 Inner Brain
T-253 Make Software
T-254 GT Interactive Software
T-255 Kodansha
T-256
T-257 Clef
T-258
T-259 C-Seven
T-260 Fujitsu Parex/JAPAN MEDIA PROGRAMMING (JAMP)
T-261 Xing Entertainment
T-262
T-263
T-264 Media Quest
T-265
T-266
T-267
T-268 WOOYOUNG
T-269
T-270 Nihon System
T-271 Scholar
T-272
T-273 Datt Japan
T-274
T-275
T-276
T-277
T-278 MediaWorks
T-279 Kadokawa Shoten
T-280 Elf
T-281
T-282 Tomy
T-283
T-284
T-285
T-286
T-287
T-288
T-289 KSS/media muse, OPEN SESAME
T-290 MYCOM (Mainichi Communications)
T-291 Warashi
T-292 Metro
T-293 SAI-MATE
T-294 Kokopeli Digital Studios
T-295
T-296 BMG Victor/Planning Office WADA (pow)
T-297 Telstar
T-298
T-299
T-300 WARP/Kumon Publishing
T-301
T-302
T-303 Masudaya
T-304
T-305
T-306 SoftOffice
T-307 Empire Interactive
T-308 Sada Soft (Genki)
T-309 Neverland/ESP (used only for Senkutsu Katsuryuu Taisen Chaos Seed, and I can't find any other Never Land game for a Sega system so)
T-310 Shar Rock
T-311 Natsume
T-312 NEXUS INTERACT/DaZZ, ISCO, Digital weare
T-313 Aplix
T-314 Omiya Soft
T-315 JVC
T-316 Zoom
T-317
T-318
T-319
T-320
T-321 Ten
T-322 FUJITSU/Digital weare
T-323
T-324
T-325 TGL (TECHNICAL GROUP LABORATORY)
T-326 Sega/Red (appears to have only been used for Sakura Taisen Teigeki Graph, but that is T-32602G)
T-327
T-328 Waka Manufacturing
T-329 Treasure/ESP (appears to only have been used for the Sega Saturn releases of Silhouette Mirage and Radiant Silvergun, with Ikaruga and Bangai-O being given ESP numbers despite being Treasure/ESP)
T-330 Tokuma Shoten Intermedia
T-331 Camelot
T-332
T-333
T-334
T-335
T-336
T-337
T-338
T-339 Sting/ESP (appears to have only been used for Baroque, with a Sega/ESP/Sting Dreamcast game being given a ESP number)
T-340 Chunsoft
T-341 Aki
T-342 From Software
T-343
T-344
T-345
T-346 Daiki
T-347
T-348 Aspect
T-349
T-350 MiCROViSion
T-351 Gainax
T-352
T-353
T-354 FortyFive (45XLV)
T-355 Enix
T-356 Ray
T-357 Tonkin House
T-358
T-359
T-360 OUTRIGGER/Infini Entertainment Technology/Sierra
T-361 Bandai Visual, B-factory
T-362 Lay-up
T-363 AXELA/BREAK
T-364 WorkJam (DIGITAL TOKYO, PLANPLAN)
T-365 Nsyscom > Syscom Entertainment
T-366
T-367 Full On Games
T-368 Eidos
T-369 UEP-System
T-370 Shouei System > Xuse
T-371 GMF/Falcom
T-372
T-373 ADK/SNK
T-374 SOFTSTAR ENTERTAINMENT
T-375 Nexton
T-376 Denshi Media Services
T-377
T-378
T-379 Takuyo
T-380 Starlight Marry
T-381 CRYSTAL VISION/Scoop
T-382 Kamata and Partners
T-383 AquaPlus
T-384 Media Gallop
T-385 Culture Brain
T-386 LOCUS/SOLITON SOFTWARE
T-387 Entertainment Software Publishing (ESP)
T-388 NEC Home Electronics
T-389
T-390 Pulse Interactive
T-391 Random House
T-392
T-393
T-394 DigiToys/VIVARIUM
T-395 Mebius
T-396 Panther Software
T-397 Hitachi Media Force
T-398 NetVillage > Gamevillage/C's ware
T-399
T-400 Noisia
T-401 Shangri-La
T-402 Crave
T-403 Metro3D
T-404 Majesco
T-405 Take 2 Interactive
T-406 Hasbro Interactive
T-407 Rage Software
T-408 Marvelous Entertainment
T-409 Bottom Up > Softmax
T-410 Daikoku Denki/Falcon
T-411 Sunrise Interactive
T-412 Bimboosoft
T-413 UFO
T-414 Mattel Interactive
T-415 Caramelpot
T-416 Vatical
T-417 Ripcord
T-418 Sega Toys
T-419 Gathering of Developers
T-420
T-421 Rockstar
T-422 Winkysoft
T-423 Cyber Front
T-424 DaZZ/Nexus Interact
T-425
T-426
T-427
T-428 KOBI
T-429 Fujicom
T-430
T-431
T-432
T-433 Real Vision
T-434 Visit
T-435 Global A Entertainment
T-436
T-437
T-438 Studio Wonder Effect
T-439 Media Factory
T-440
T-441 Red
T-442
T-443 Agetec
T-444 Abel
T-445 Softmax
T-446 ISAO
T-447 Kool Kizz Amusement Works
T-448 GeneX/Ninelives
T-449 Xicat Interactive
T-450 Swing! Entertainment
T-451 Yuke's
T-452
T-453
T-454 AAA Game
T-455 TV Asahi
T-456 Crazy Games
T-457 Atmark/Yuki Enterprise
T-458 Hackberry
T-459
T-460 AIA
T-461 Starfish
T-462 Idea Factory
T-463 Broccoli
T-464
T-465 Princess Soft
T-466 Big Ben
T-467 G.rev
T-468
T-469 Symbio Planning
T-470
T-471 Alchemist
T-472 D3Publisher
T-473 SNK Playmore
T-474 D3Publisher
T-475 "Chara, Rainsoftware/Milksoft"
T-476 GN Software (Good Navigate)
T-477 Alfa System
T-478 Milestone Inc.
T-479 Triangle Service

Publishers Whose Codes Are Unknown

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