ref: 9f82fa4cf7df9e18d8b44bc91c525411a51f8e2e
dir: /src/fix/rgbfix.1/
.\" .\" This file is part of RGBDS. .\" .\" Copyright (c) 2010-2017, Anthony J. Bentley and RGBDS contributors. .\" .\" SPDX-License-Identifier: MIT .\" .Dd December 5, 2019 .Dt RGBFIX 1 .Os .Sh NAME .Nm rgbfix .Nd Game Boy header utility and checksum fixer .Sh SYNOPSIS .Nm .Op Fl jsVv .Op Fl C | c .Op Fl f Ar fix_spec .Op Fl i Ar game_id .Op Fl k Ar licensee_str .Op Fl l Ar licensee_id .Op Fl m Ar mbc_type .Op Fl n Ar rom_version .Op Fl p Ar pad_value .Op Fl r Ar ram_size .Op Fl t Ar title_str .Ar file .Sh DESCRIPTION The .Nm program changes headers of Game Boy ROM images. It also performs other correctness operations, such as padding. .Pp Note that options can be abbreviated as long as the abbreviation is unambiguous: .Fl Fl verb is .Fl Fl verbose , but .Fl Fl ver is invalid because it could also be .Fl Fl version . The arguments are as follows: .Bl -tag -width Ds .It Fl C , Fl Fl color-only Set the Game Boy Color\(enonly flag: .Ad 0x143 = 0xC0. If both this and the .Fl c flag are set, this takes precedence. .It Fl c , Fl Fl color-compatible Set the Game Boy Color\(encompatible flag: .Ad 0x143 = 0x80. If both this and the .Fl C flag are set, .Fl C takes precedence. .It Fl f Ar fix_spec , Fl Fl fix-spec Ar fix_spec Fix certain header values that the Game Boy checks for correctness. Alternatively, intentionally trash these values by writing their binary inverse instead. .Ar fix_spec is a string containing any combination of the following characters: .Pp .Bl -tag -compact -width xx .It Cm l Fix the Nintendo logo .Pq Ad 0x104 Ns \(en Ns Ad 0x133 . .It Cm L Trash the Nintendo logo. .It Cm h Fix the header checksum .Pq Ad 0x14D . .It Cm H Trash the header checksum. .It Cm g Fix the global checksum .Pq Ad 0x14E Ns \(en Ns Ad 0x14F . .It Cm G Trash the global checksum. .El .It Fl i Ar game_id , Fl Fl game-id Ar game_id Set the game ID string .Pq Ad 0x13F Ns \(en Ns Ad 0x142 to a given string of exactly 4 characters. If both this and the title are set, the game ID will overwrite the overlapping portion of the title. .It Fl j , Fl Fl non-japanese Set the non-Japanese region flag: .Ad 0x14A = 1. .It Fl k Ar licensee_str , Fl Fl new-licensee Ar licensee_str Set the new licensee string .Pq Ad 0x144 Ns \(en Ns Ad 0x145 to a given string, truncated to at most two characters. .It Fl l Ar licensee_id , Fl Fl old-licensee Ar licensee_id Set the old licensee code, .Ad 0x14B , to a given value from 0 to 0xFF. This value is deprecated and should be set to 0x33 in all new software. .It Fl m Ar mbc_type , Fl Fl mbc-type Ar mbc_type Set the MBC type, .Ad 0x147 , to a given value from 0 to 0xFF. .It Fl n Ar rom_version , Fl Fl rom-version Ar rom_version Set the ROM version, .Ad 0x14C , to a given value from 0 to 0xFF. .It Fl p Ar pad_value , Fl Fl pad-value Ar pad_value Pad the image to a valid size with a given pad value from 0 to 0xFF. .Nm will automatically pick a size from 32 KiB, 64 KiB, 128 KiB, ..., 8192 KiB. The cartridge size byte .Pq Ad 0x148 will be changed to reflect this new size. .It Fl r Ar ram_size , Fl Fl ram-size Ar ram_size Set the RAM size, .Ad 0x149 , to a given value from 0 to 0xFF. .It Fl s , Fl Fl sgb-compatible Set the SGB flag: .Ad 0x146 = 3. This flag will be ignored by the SGB unless the old licensee code is 0x33! .It Fl t Ar title , Fl Fl title Ar title Set the title string .Pq Ad 0x134 Ns \(en Ns Ad 0x143 to a given string, truncated to at most 16 characters. It is recommended to use 15 characters instead, to avoid clashing with the CGB flag .Po Fl c or .Fl C .Pc . If both this and the game ID are set, the game ID will overwrite the overlapping portion of the title. .It Fl V , Fl Fl version Print the version of the program and exit. .It Fl v , Fl Fl validate Equivalent to .Fl f Cm lhg . .El .Sh EXAMPLES Most values in the ROM header are only cosmetic. The bare minimum requirements for a workable program are the header checksum, the Nintendo logo, and (if needed) the CGB/SGB flags. It is a good idea to pad the image to a valid size as well .Pq Do valid Dc meaning a power of 2, times 32 KiB . .Pp The following will make a plain, non-color Game Boy game without checking for a valid size: .Pp .D1 $ rgbfix -v foo.gb .Pp The following will make a SGB-enabled, color-enabled game with a title of .Dq foobar , and pad it to a valid size. .Po The Game Boy itself does not use the title, but some emulators or ROM managers do. .Pc .Pp .D1 $ rgbfix -vcs -l 0x33 -p 255 -t foobar baz.gb .Pp The following will duplicate the header (sans global checksum) of the game .Dq Survival Kids : .Pp .D1 $ rgbfix -cjsv -k A4 -l 0x33 -m 0x1B -p 0xFF -r 3 -t SURVIVALKIDAVKE \ SurvivalKids.gbc .Sh BUGS Please report bugs on .Lk https://github.com/rednex/rgbds/issues GitHub . .Sh SEE ALSO .Xr rgbasm 1 , .Xr rgblink 1 , .Xr rgbds 7 .Sh HISTORY .Nm was originally released by Carsten S\(/orensen as a standalone program called gbfix, and was later packaged in RGBDS by Justin Lloyd. It is now maintained by a number of contributors at .Lk https://github.com/rednex/rgbds .