ref: b9f92536a9bce4a28e61a9a0e011d316e001ec34
dir: /src/fix/rgbfix.1/
.Dd $\&Mdocdate$ .Dt RGBFIX 1 .Os RGBDS Manual .Sh NAME .Nm rgbfix .Nd Game Boy checksum fixer .\" SECTION .Sh SYNOPSIS .Nm rgbfix .Op Fl Ccjsv .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 Ns Op .gb .\" SECTION .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 .\" ITEM .It Fl C Set the Game Boy Color\(enonly flag: [0x143] = 0xC0. If both this and the .Fl c flag are set, this takes precedence. .\" ITEM .It Fl c Set the Game Boy Color\(encompatible flag: [0x143] = 0x80. If both this and the .Fl C flag are set, .Fl C takes precedence. .\" ITEM .It Fl j Set the non-Japanese region flag: [0x14A] = 1. .\" ITEM .It Fl k Ar licensee_str Set the new licensee string ([0x144\(en0x145]) to a given string, truncated to at most two characters. .\" ITEM .It Fl l Ar licensee_id Set the old licensee code, [0x14B], to a given value from 0 to 0xFF. This value is deprecated and should be set to 0x33 in all new software. .\" ITEM .It Fl m Ar mbc_type Set the MBC type, [0x147], to a given value from 0 to 0xFF. .\" ITEM .It Fl n Ar rom_version Set the ROM version, [0x14C], to a given value from 0 to 0xFF. .\" ITEM .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 ([0x148]) will be changed to reflect this new size. .\" ITEM .It Fl r Ar ram_size Set the RAM size, [0x149], to a given value from 0 to 0xFF. .\" ITEM .It Fl s Set the SGB flag: [0x146] = 3. .\" ITEM .It Fl t Ar title Set the title string ([0x134\(en0x143]) 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 ( .Fl c or .Fl C .Ns ). .\" ITEM .It Fl v Validate the header and fix checksums: the Nintendo character area ([0x104\(en0x133]), the header checksum ([0x14D]), and the global checksum ([0x14E\(en0x14F]). .El .\" SECTION .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 ("valid" 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 "foobar", and pad it to a multiple of 32KiB. (The Game Boy itself does not use the title, but some emulators or ROM managers might.) .Pp .D1 $ rgbfix \-vcs \-p 0 \-t foobar baz.gb .Pp The following will duplicate the header (sans global checksum) of the game "Survival Kids": .Pp .D1 $ rgbfix \-cjsv \-k A4 \-m 0x1B \-p 0xFF \-r 3 \-t SURVIVALKIDAVKE SurvivalKids.gbc .\" SECTION .Sh SEE ALSO .Xr rgbds 7 , .Xr rgbasm 1 , .Xr rgblib 1 , .Xr rgblink 1 , .Xr gbz80 7 .\" SECTION .Sh HISTORY .Nm was originally released by Carsten S\(/orensen as a standalone program called gbfix. It was later integrated with the ASMotor package, which became RGBDS.