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Third-party T-series codes

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When Sega was producing video game hardware, the company used T-series codes to identify officially licensed third party publishers for its systems. T-series codes typically appear on the boxes and/or media of third-party Sega software, in a similar manner to how official G-series or MK-series identifers are displayed.

T-series codes came into use during the late 1980s and were issued until the mid-2000s. Prior to this there were relatively few third-party publishers and no official identification system - Sega typically published all SG-1000 and Sega Master System games (notable exceptions include Salio and various Western companies involved in SC-3000 development), however this changed by the release of the Sega Mega Drive. The first T-series codes appeared publically in 1989.

The first two (or three) digits after the T represent the publisher. Any numbers after this represent the specific release, and a letter on the end specifies a console (the latter not coming into use until the mid-90s).

Not all publishers followed these rules, most notably Electronic Arts which did not show its T-series code on Mega Drive releases.

Within Games

Mega Drive 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 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.

List

T-Code Publisher (Label/Team/Alias)
T-11 Taito
T-12 Capcom
T-13 Data East
T-14 Namco (Namcot)
T-15 Sun Electronics (Sunsoft)
T-16 Ma-Ba
T-17 Dempa
T-18 Tecno Soft
T-19 Tecno Soft?
(using title unknown.)
T-20 Asmik
T-21 ASCII
T-22 Micronet
T-23 VIC Tokai
T-24 Treco,Sammy
T-25 Nippon Computer Systems (Masaya)
T-26 Sigma Enterprises -> Sigma
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 Seismic Software
(MUSHA (JP) Toaplan/Compile used this code.)
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, Micro World
T-50 Electronic Arts
T-51 Microcabin
T-52 SystemSoft -> SystemSoft Alpha
(Microcabin used this code in Saturn and Dreamcast.)
T-53 Riverhillsoft
T-54 Face
T-55 Nuvision Entertainment
T-56 Razorsoft
T-57 Jaleco
T-58 Visco
T-59
T-60 Victor Musical Industries -> Victor Entertainment -> Victor Soft
T-61 Toyo Recording Co. (Wonder Amusement Studio)
T-62 Sony Imagesoft
T-63 Toshiba EMI
T-64 Information Global Service
T-65 Tsukuda Ideal
T-66 Compile
T-67 Home Data -> Magical
T-68 CSK Research Institute -> CRI
T-69 Arena Entertainment
T-70 Virgin Interactive
T-71 Nihon Bussan (Nichibutsu)
T-72 Varie
T-73 Coconuts JapanSoft Vision
T-74 PALSOFT
T-75 Pony Canyon
T-76 Koei
T-77 Takeru (Sur De Wave)
T-78
T-79 U.S. Gold
T-80
T-81 Acclaim Entertainment, Flying Edge
T-82
T-83 GameTek
T-84 Datawest
T-85 PCM Complete
T-86 Absolute Entertainment
T-87 Mindscape -> The Software Toolworks
T-88 Domark
T-89 Parker Brothers
T-90
T-91 Pack-In-Video -> Victor Interactive Software (Pack-In-SoftVictor Soft)
T-92 Polydor (Sandstorm)
T-93 Sony?
(using title unknown.)
T-94
T-95 Konami
T-96
T-97 TradewestWilliams EntertainmentMidway Games
T-98
T-99 Success
T-100 THQ, Black Pearl Software
T-101 TecMagik Entertainment
T-102 Samsung?
(using title unknown.)
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 The Learning Company
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 Interactive Entertainment
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 (Hudson Soft)
T-144 Atlus
T-145 Sony Music Entertainment
T-146 Takara
T-147 Sansan
T-148
T-149 Nisshouiwai Infocom
T-150 Imagineer (Imadio)
T-151 Infogrames
T-152 Davidson & Associates
T-153 Rocket Science Games
T-154 Technōs 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 Software
T-165 Seta
T-166 Altron
T-167 ASK Kodansha
T-168 Athena
T-169 Gakken
T-170 General Entertainment
T-171
T-172 EA Sports?
(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 Interactive Entertainment, BMG Victor -> BMG Japan
T-181 Obunsha
T-182 Thinking Cap
T-183
T-184
T-185 Gaga Communications
T-186 SoftBank -> Game Bank
T-187 Naxat Soft (Pionesoft)
T-188 Mizuki -> SpikeMaxbet
T-189 KAZe
T-190
T-191
T-192
T-193 Sega Yonezawa
T-194 We Net
T-195 Datam Polystar
T-196
T-197 KID
T-198 Epoch
T-199 Ving
T-200 Yoshimoto Kogyo
T-201 NEC Interchannel -> InterChannel
T-202 Sonnet Computer Entertainment
T-203 Game Studio
T-204 Psikyo
T-205 Media Entertainment
T-206 Banpresto
T-207 Ecseco Development
T-208 Bullet-Proof Software (BPS)
T-209 Sieg
T-210 Yanoman
T-211
T-212 Oz Club
T-213 Nihon Create
T-214 Media Rings Corporation
T-215 Shoeisha
T-216 OPeNBooK
T-217 Hakuhodo (Hamlet)
T-218 Aroma (Yumedia)
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
T-228
T-229 Titus
T-230 LucasArts
T-231 Pai
T-232 Ecole (Reindeer)
T-233 Nayuta
T-234 Bandai Visual
T-235 Quintet
T-236
T-237
T-238
T-239 Disney Interactive
T-240 9003 -> OpenBook9003
T-241 Multisoft
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
T-261 Xing Entertainment
T-262
T-263
T-264 Media Quest
T-265
T-266
T-267
T-268 Wooyoung System
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
T-290 Mainichi Communications
T-291 Warashi
T-292 Metro
T-293 Sai-Mate
T-294 Kokopeli Digital Studios
T-295
T-296 Planning Office Wada (POW)
T-297 Telstar
T-298
T-299
T-300 WarpKumon Publishing
T-301
T-302
T-303 Masudaya
T-304
T-305
T-306 Soft Office
T-307 Empire Interactive
T-308 Genki, (Sada Soft)
T-309 Neverland
T-310 Shar Rock
T-311 Natsume
T-312 Nexus Interact
T-313 Aplix Corporation
T-314 Omiya Soft
T-315 JVC
T-316 Zoom (company)
T-317
T-318
T-319
T-320
T-321 TEN Institute
T-322 Fujitsu
T-323
T-324
T-325 TGL
T-326 Red Company -> Red Entertainment
T-327
T-328 Waka Manufacturing
T-329 Treasure
(Appears to only have been used for the Sega Saturn releases of Silhouette Mirage and Radiant Silvergun)
T-330 Tokuma Shoten Intermedia
T-331 Sonic! Software Planning -> Camelot
T-332
T-333
T-334
T-335
T-336
T-337
T-338
T-339 Sting
(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 Micro Vision
T-351 Gainax
T-352
T-353
T-354 FortyFive (45XLV)
T-355 Enix
T-356 Ray Corporation
T-357 Tonkin House
T-358
T-359
T-360 Outrigger
T-361 B-Factory
T-362 LayUp
T-363 Axela
T-364 WorkJam
T-365 Nihon Syscom -> Syscom Entertainment
T-366
T-367 FOG (Full On Games)
T-368 Eidos Interactive
T-369 UEP Systems
T-370 Shouei System
T-371 GMF
T-372
T-373 ADK
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
T-382 Kamata and Partners
T-383 AquaPlus
T-384 Media Gallop
T-385 Culture Brain
T-386 Locus
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 Vivarium
T-395 Mebius
T-396 Panther Software
T-397 TBS
T-398 NetVillage (Gamevillage)
T-399
T-400 Vision (Noisia)
T-401 Shangri-La
T-402 Crave Entertainment
T-403 Metro3D
T-404 Majesco
T-405 Take-Two Interactive
T-406 Hasbro Interactive
T-407 Rage Software -> Rage Games
T-408 Marvelous Entertainment
T-409 Bottom Up
T-410 Daikoku Denki
T-411 Sunrise Interactive
T-412 Bimboosoft
T-413 UFO
T-414 Mattel Interactive
T-415 CaramelPot
T-416 Vatical Entertainment
T-417 Ripcord Games
T-418 Sega Toys
T-419 Gathering of Developers
T-420
T-421 Rockstar Games
T-422 Winkysoft
T-423 Cyberfront
T-424 DaZZ
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?
(using title unknown.)
T-442
T-443 Agetec
T-444 Abel
T-445 Softmax
T-446 Isao
T-447 Kool Kizz
T-448 GeneX
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
T-458 Hackberry
T-459
T-460 AIA
T-461 Starfish-SD
T-462 Idea Factory
T-463 Broccoli
T-464
T-465 Oaks (Princess Soft)
T-466 Bigben Interactive
T-467 G.rev
T-468
T-469 Symbio Planning
T-470
T-471 Alchemist
T-472
T-473 SNK Playmore
T-474 D3Publisher
T-475 Rain Software (Charara)
T-476 Good Navigate (GN Software)
T-477 Alfa System
T-478 Milestone Inc.
T-479 Triangle Service

Publishers Whose Codes Are Unknown