ref: cde607c09cc5964b4e7836da08adb7b558a3a275
dir: /src/fix/rgbfix.1/
.\" Copyright © 2010 Anthony J. Bentley <[email protected]> .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd April 17, 2017 .Dt RGBFIX 1 .Os RGBDS Manual .Sh NAME .Nm rgbfix .Nd Game Boy checksum fixer .Sh SYNOPSIS .Nm rgbfix .Op Fl Ccjsv .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 filetype operations, such as truncation. The arguments are as follows: .Bl -tag -width Ds .It Fl C 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 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 i 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 Set the non-Japanese region flag: .Ad 0x14A = 1. .It Fl k 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 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 Set the MBC type, .Ad 0x147 , to a given value from 0 to 0xFF. .It Fl n Ar rom_version Set the ROM version, .Ad 0x14C , to a given value from 0 to 0xFF. .It Fl p 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 32KiB, 64KiB, 128KiB, ..., 8192KiB and give a warning thereafter. The cartridge size byte .Pq Ad 0x148 will be changed to reflect this new size. .It Fl r Ar ram_size Set the RAM size, .Ad 0x149 , to a given value from 0 to 0xFF. .It Fl s Set the SGB flag: .Ad 0x146 = 3. .It Fl t 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 Validate the header and fix checksums: the Nintendo character area .Pq Ad 0x104 Ns \(en Ns Ad 0x133 , the header checksum .Pq Ad 0x14D , and the global checksum .Pq Ad 0x14E Ns \(en Ns Ad 0x14F . .El .Sh EXAMPLES Most values in the ROM header are only cosmetic. The bare minimum requirements for a workable image are checksums, 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 multiple of 32KiB . .Pp The following will make a plain, no-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 multiple of 32KiB. .Po The Game Boy itself does not use the title, but some emulators or ROM managers might. .Pc .Pp .D1 $ rgbfix -vcs -l 0x33 -p 0 -t foobar baz.gb .Pp The following will duplicate the header .Pq 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 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 .