| Offset | Size | Section | Description |
|---|---|---|---|
| H100 | 16 bytes | File Identifier | 'SEGA MEGA DRIVE' or 'SEGA GENESIS' |
| H110 | 16 bytes | Copyright notice | See Below |
| H120 | 48 bytes | Domestic game name | Original Name [48 bytes] |
| H150 | 48 bytes | Overseas game name | Worldwide Name [48 bytes] |
| H180 | 14 bytes | Product Code | 'PT XXXXXXXXXXX'// PT=Product type X=Product Code after '-' is the version number |
| H18E | 02 bytes | Checksum | Checksum of ROM |
| H190 | 16 bytes | I/O Support | Can contain up to 16. Unused need to be filled with spaces. See Below |
| H1A0 | 08 bytes | ROM capacity | Start Address [4 bytes; most cases 0] End Address [4 bytes] |
| H1A8 | 08 bytes | RAM capacity | Start Address [4 bytes] End Address [4 bytes] |
| H1B0 | 12 bytes | External RAM | Unknown |
| H1BC | 12 bytes | MODEM Support | If not supported filled with spaces otherwise 'MOxxxxyy.z' //x=Company Code y=MODEM NO. z=Version |
| H1C8 | 40 bytes | MEMO | Seems just to be reserved for Memos. |
| H1F0 | 03 bytes | Countries | Can contain up to 3. Unused need to be filled with spaces. See Below |
If two Companies are using the same Code, they are seperated by a backslash (/)
| Code | Company |
|---|---|
| ACLD | Ballistic |
| ASCI | Asciiware |
| RSI | Razorsoft |
| SEGA | SEGA |
| TREC | Treco |
| VRGN | Virgin Games |
| WSTN | Westone |
| 10 | Takara |
| 11 | Taito or Accolade |
| 12 | Capcom |
| 13 | Data East |
| 14 | Namco or Tengen |
| 15 | Sunsoft |
| 16 | Bandai |
| 17 | Dempa |
| 18 | Technosoft |
| 19 | Technosoft |
| 20 | Asmik |
| 22 | Micronet |
| 23 | Vic Tokai |
| 24 | American Sammy |
| 29 | Kyugo |
| 32 | Wolfteam |
| 33 | Kaneko |
| 35 | Toaplan |
| 36 | Tecmo |
| 40 | Toaplan |
| 42 | UFL Company Limited |
| 43 | Human |
| 45 | Gane Arts |
| 47 | Sage's Creation |
| 48 | Tengen |
| 49 | Renovation or Telenet |
| 50 | Electronic Arts |
| 56 | Razorsoft |
| 58 | Mentrix |
| 60 | Victor Musical Industries |
| 69 | Arena |
| 70 | Virgin |
| 73 | Soft Vision |
| 74 | Palsoft |
| 76 | Koei |
| 79 | U.S. Gold |
| 81 | Acclaim or Flying Edge |
| 83 | Gametek |
| 86 | Absolute |
| 93 | Sony |
| 95 | Konami |
| 97 | Tradewest |
| 100 | T*HQ Software |
| 101 | Tecmagik |
| 112 | Designer Software |
| 113 | Psygnosis |
| 119 | Accolade |
| 120 | Code Masters |
| 125 | Interplay |
| 130 | Activision |
| 132 | Shiny & Playmates |
| 144 | Atlus |
| 151 | Infogrames |
| 161 | Fox Interactive |
| 239 | Disney Interactive |
| ID | Description |
|---|---|
| GM | Game |
| Al | Education |
| ID | Description |
|---|---|
| 0 | Joystic for MS |
| 4 | Team Play |
| 6 | 6-button Joypad |
| B | Control Ball |
| C | CD-ROM |
| F | Floppy Disk Drive |
| J | Joypad |
| K | Keyboard |
| L | Activator |
| M | Mega Mous |
| P | Printer |
| R | Serial RS232C |
| T | Tablet |
| V | Paddle Controller |
| ID | Description |
|---|---|
| 4 | Brazil |
| 8 | Hong Kong |
| A | Asia |
| B | Brazil |
| E | Europe |
| F | France |
| J | Japan |
| U | USA |