View source for Third-party T-series codes

[[Sega]] uses '''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)T''xxx'' ''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.

{|class="prettytable sortable"
!T-Code
!Developer
|-
|T-11||[[Taito]]
|-
|T-12||[[Capcom]]
|-
|T-13||[[Data East]]
|-
|T-14||[[Namco]]
|-
|T-15||[[Sunsoft]]
|-
|T-16||[[Bandai]]
|-
|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||Genki
|-
|T-29||Kyugo
|-
|T-30||[[Video System]]
|-
|T-31||[[SNK]]
|-
|T-32||[[Wolf Team]] (possibly also [[Nextech]], as a prototype of ''[[Crusader of Centy]]'' has this in its header)
|-
|T-33||[[Kaneko]]
|-
|T-34||Dreamworks (?)
|-
|T-35||[[Seismic]], [[Compile]]
|-
|T-36||[[Tecmo]]
|-
|T-37||
|-
|T-38||[[Sanritsu]]
|-
|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
|-
|T-47||Sage's Creation
|-
|T-48||[[Tengen]], [[Time Warner Interactive]]
|-
|T-49||[[Telenet Japan]], also used for [[RIOT]] division
|-
|T-50||[[Electronic Arts]]
|-
|T-51||Microcabin
|-
|T-52||[[SystemSoft]]
|-
|T-53||RiverHill Soft
|-
|T-54||Face
|-
|T-55||[[Nuvision]]
|-
|T-56||[[Razorsoft]]
|-
|T-57||[[Jaleco]]
|-
|T-58||[[Visco]]
|-
|T-59||
|-
|T-60||Victor Entertainment
|-
|T-61||Wonder Amusement Studio
|-
|T-62||[[Sony Imagesoft]]
|-
|T-63||TOSHIBA EMI/TAMTAM/System Soft
|-
|T-64||IGS
|-
|T-65||[[Tsukuda Original]]
|-
|T-66||[[Compile]]
|-
|T-67||Magical
|-
|T-68||[[CSK Research Institute]] (CRI)
|-
|T-69||[[Arena]]
|-
|T-70||[[Virgin Interactive]]
|-
|T-71||Nihon Bussan (Nichibutsu)
|-
|T-72||Varie Corporation
|-
|T-73||COCONUTS JAPAN ENTERTAINMENT
|-
|T-74||Soft Vision
|-
|T-75||[[Pony Canyon]]
|-
|T-76||[[Koei]]
|-
|T-77||Sur De Wave
|-
|T-79||[[U.S. Gold]]
|-
|T-81||[[Flying Edge]]/[[Acclaim]]
|-
|T-83||[[GameTek]]
|-
|T-85||PCM
|-
|T-86||[[Absolute Entertainment]]
|-
|T-87||[[Mindscape]]/Software Toolworks
|-
|T-88||[[Domark]]
|-
|T-89||[[Parker Brothers]]
|-
|T-91||Pack-In-Video > Victor Interactive Sofware
|-
|T-92||Polydor K.K.
|-
|T-93||Sony
|-
|T-95||[[Konami]]
|-
|T-97||[[Tradewest]]
|-
|T-99||[[Success]]
|-
|T-100||Black Pearl Software (later THQ)
|-
|T-101||[[TecMagik]]
|-
|T-103||[[Takara]]
|-
|T-105||Shogakukan Production
|-
|T-106||[[Electronic Arts Victor]]
|-
|T-107||Electro Brain
|-
|T-109||Saddleback Graphics
|-
|T-110||Dynamix
|-
|T-111||[[American Laser Games]]
|-
|T-112||[[Hi-Tech Expressions]]
|-
|T-113||[[Psygnosis]]
|-
|T-114||[[T&E Soft]]
|-
|T-115||[[Core Design]]
|-
|T-118||Compton's New Media
|-
|T-119||[[Accolade]]
|-
|T-120||[[Codemasters]]
|-
|T-121||Readysoft
|-
|T-123||[[Gremlin Interactive]]
|-
|T-124||[[Spectrum Holobyte]]
|-
|T-125||[[Electronic Arts Victor]], [[Interplay]]
|-
|T-126||[[Maxis]]
|-
|T-127||[[Working Designs]]
|-
|T-130||[[Activision]]
|-
|T-132||Shiny & Playmates
|-
|T-133||[[Bandai]]
|-
|T-135||CapDisc
|-
|T-137||ASC Games
|-
|T-139||[[Viacom New Media]]
|-
|T-141||Toei Video
|-
|T-143||[[Hudson Soft]]
|-
|T-144||[[Atlus]]
|-
|T-145||Sony Music Entertainment
|-
|T-146||[[Takara]]
|-
|T-147||[[Sansan]] Co., Ltd.
|-
|T-149||Infocom
|-
|T-150||[[Imagineer]]
|-
|T-151||[[Infogrames]]
|-
|T-152||Davidson & Associates
|-
|T-153||[[Rocket Science Games]]
|-
|T-154||[[Technos Japan]]
|-
|T-157||Angel
|-
|T-158||[[Mindscape]]
|-
|T-159||BMG Victor, [[Crystal Dynamics]]
|-
|T-160||[[Time Warner Interactive]]
|-
|T-161||[[Fox Interactive]]
|-
|T-162||[[Digital Pictures]]
|-
|T-164||[[Ocean]]
|-
|T-165||Seta
|-
|T-166||ALTRON
|-
|T-167||ASK Kodansha
|-
|T-168||Athena
|-
|T-170||General Entertainment (GE)
|-
|T-174||Glams
|-
|T-176||[[ASCII|ASCII Something Good]]
|-
|T-177||[[Ubisoft]]
|-
|T-178||Hitachi
|-
|T-180||BMG Japan
|-
|T-185||Gaga Communications
|-
|T-186||Game Bank, Soft Bank
|-
|T-187||[[Naxat Soft]] (now Kaga Tech) > Pionesoft
|-
|T-188||Mizuki > Maxbet > Spike, Geo
|-
|T-189||KAZe
|-
|T-194||We Net
|-
|T-195||Datam Polystar
|-
|T-197||[[KID]] (Kindle Imagine Develop)
|-
|T-198||Epoch/Sakata SAS
|-
|T-199||[[Ving]]
|-
|T-200||Yoshimoto Kogyo
|-
|T-201||NEC 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-212||Oz Club
|-
|T-213||Nihon Greate
|-
|T-214||Media Rings
|-
|T-215||Shoeisha
|-
|T-216||Open Book
|-
|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-227||Vantan International/Electric Dreams
|-
|T-229||Titus
|-
|T-230||[[LucasArts]]
|-
|T-231||Pai
|-
|T-232||Ecole > Reindeer
|-
|T-234||Bandai Visual
|-
|T-235||Quintet
|-
|T-239||[[Disney Interactive]]
|-
|T-240||9003 > OpenBook9003
|-
|T-241||Multisoft/Millenium Interactive
|-
|T-242||Sky Think System
|-
|T-243||OCC
|-
|T-246||INCREMENT P (iPC)
|-
|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-257||Clef
|-
|T-259||Sega (? - Cleaning Kit)
|-
|T-260||Fujitsu Parex/JAPAN MEDIA PROGRAMMING (JAMP)
|-
|T-261||Xing Entertainment
|-
|T-264||Media Quest
|-
|T-268||WOOYOUNG
|-
|T-270||Nihon System
|-
|T-271||Virgin Interactive Entertainment, SCHOLAR
|-
|T-273||Datt Japan
|-
|T-278||MediaWorks
|-
|T-279||KADOKAWA
|-
|T-280||Elf
|-
|T-282||[[Tomy]]
|-
|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-296||BMG Victor/Planning Office WADA (pow)
|-
|T-297||Telstar
|-
|T-300||WARP
|-
|T-303||Masudaya
|-
|T-306||Soft Office
|-
|T-307||Empire Interactive
|-
|T-308||Sada soft (Genki)
|-
|T-309||ENTERTAINMENT SOFTWARE PUBLISHING (ESP), NEVER LAND/TAITO
|-
|T-310||Shar Rock
|-
|T-311||[[Jaleco]], [[Natsume]]
|-
|T-312||NEXUS INTERACT/DaZZ, ISCO, Digital weare
|-
|T-313||Aplix
|-
|T-314||Omiya Soft
|-
|T-315||Victor JVC
|-
|T-316||Zoom
|-
|T-321||Ten
|-
|T-322||FUJITSU/Digital weare
|-
|T-325||TGL (TECHNICAL GROUP LABORATORY)
|-
|T-326||[[RED]]/[[SIMS]]
|-
|T-328||Waka Manufacturing
|-
|T-329||ENTERTAINMENT SOFTWARE PUBLISHING (ESP), [[Treasure]]
|-
|T-330||Tokuma Shoten Intermedia
|-
|T-331||Camelot <!-- is this Camelot Software Planning? - andlabs -->
|-
|T-339||ENTERTAINMENT SOFTWARE PUBLISHING (ESP), STING
|-
|T-340||[[Chunsoft]]
|-
|T-341||Aki
|-
|T-342||From Software
|-
|T-346||Daiki
|-
|T-348||[[Aspect]]
|-
|T-350||MiCROViSion
|-
|T-351||GAINAX
|-
|T-354||FortyFive (45XLV)
|-
|T-355||[[Enix]]
|-
|T-356||Ray
|-
|T-357||TONKINHOUSE
|-
|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-367||Full On Games
|-
|T-368||[[Eidos]]
|-
|T-369||UEP-System
|-
|T-370||Shouei System > Xuse
|-
|T-371||GMF/[[Falcom]]
|-
|T-373||ADK/SNK
|-
|T-374||SOFTSTAR ENTERTAINMENT
|-
|T-375||Nexton
|-
|T-376||Denshi Media Services
|-
|T-379||Takuyo
|-
|T-380||Starlight Marry
|-
|T-381||CRYSTAL VISION/Scoop
|-
|T-382||K and P
|-
|T-383||AquaPlus
|-
|T-384||Media Gallop/K and P
|-
|T-385||Culture Brain
|-
|T-386||LOCUS/SOLITON SOFTWARE
|-
|T-387||Entertainment Software Publishing (ESP)
|-
|T-388||NEC Home Electronics
|-
|T-390||Pulse Interactive
|-
|T-391||Random House
|-
|T-394||DigiToys/VIVARIUM
|-
|T-395||Mebius
|-
|T-396||Panther Software
|-
|T-397||Hitachi Media Force
|-
|T-398||Net Village > Gamevillage/C's ware
|-
|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 PLC|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
|-
|T-415||Caramelpot
|-
|T-416||Vatical
|-
|T-417||Ripcord
|-
|T-418||[[Sega Toys]]
|-
|T-419||Gathering of Developers
|-
|T-421||Rockstar
|-
|T-422||[[Winkysoft]]
|-
|T-423||Cyber Front
|-
|T-424||DaZZ/Nexus Interact
|-
|T-428||KOBI
|-
|T-429||Fujicom
|-
|T-433||Real Vision
|-
|T-434||Visit
|-
|T-435||Global A Entertainment
|-
|T-438||Studio Wonder Effect
|-
|T-439||Media Factory
|-
|T-441||Red
|-
|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
|-
|T-450||Swing! Entertainment
|-
|T-451||Yuke's/THQ
|-
|T-455||TV Asahi
|-
|T-456||Crazy Games
|-
|T-457||Atmark/Yuki Enterprise
|-
|T-458||Hackberry
|-
|T-460||[[Jaleco]]
|-
|T-461||Star Fish
|-
|T-462||[[Idea Factory]]
|-
|T-463||Brocolli
|-
|T-465||Princess Soft
|-
|T-466||Big Ben
|-
|T-467||[[G.rev]]
|-
|T-469||Symbio Planning
|-
|T-471||Alchemist
|-
|T-472||D3 Publisher
|-
|T-473||[[Playmore]]/[[SNK]]
|-
|T-474||D3 Publisher
|-
|T-475||"Chara, Rainsoftware/Milksoft"
|-
|T-476||GN Software (Good Navigate)
|-
|T-477||Alfa System
|-
|T-478||[[Milestone Inc.]]
|-
|T-479||[[Triangle Service]]
|}

[[Category:Sega]]