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<table class="head">
<tr>
<td class="head-ltitle">RGBFIX(1)</td>
<td class="head-vol">General Commands Manual</td>
<td class="head-rtitle">RGBFIX(1)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">rgbfix</code> —
<div class="Nd">Game Boy checksum fixer</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<table class="Nm">
<tr>
<td><code class="Nm">rgbfix</code></td>
<td>[<code class="Fl">-CcjsVv</code>] [<code class="Fl">-f</code>
<var class="Ar">fix_spec</var>] [<code class="Fl">-i</code>
<var class="Ar">game_id</var>] [<code class="Fl">-k</code>
<var class="Ar">licensee_str</var>] [<code class="Fl">-l</code>
<var class="Ar">licensee_id</var>] [<code class="Fl">-m</code>
<var class="Ar">mbc_type</var>] [<code class="Fl">-n</code>
<var class="Ar">rom_version</var>] [<code class="Fl">-p</code>
<var class="Ar">pad_value</var>] [<code class="Fl">-r</code>
<var class="Ar">ram_size</var>] [<code class="Fl">-t</code>
<var class="Ar">title_str</var>] <var class="Ar">file</var></td>
</tr>
</table>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Nm">rgbfix</code> program changes headers of Game Boy ROM
images. It also performs other filetype operations, such as truncation. The
arguments are as follows:
<dl class="Bl-tag">
<dt><a class="permalink" href="#C"><code class="Fl" id="C">-C</code></a></dt>
<dd>Set the Game Boy Color–only flag: <span class="Ad">0x143</span> =
0xC0. If both this and the <code class="Fl">-c</code> flag are set, this
takes precedence.</dd>
<dt><a class="permalink" href="#c"><code class="Fl" id="c">-c</code></a></dt>
<dd>Set the Game Boy Color–compatible flag:
<span class="Ad">0x143</span> = 0x80. If both this and the
<code class="Fl">-C</code> flag are set, <code class="Fl">-C</code> takes
precedence.</dd>
<dt><a class="permalink" href="#f"><code class="Fl" id="f">-f</code></a>
<var class="Ar">fix_spec</var></dt>
<dd>Fix certain header values that the Game Boy checks for correctness.
Alternatively, intentionally trash these values by writing their binary
inverse instead. <var class="Ar">fix_spec</var> is a string containing any
combination of the following characters:
<p class="Pp"></p>
<dl class="Bl-tag Bl-compact">
<dt><a class="permalink" href="#l"><code class="Cm" id="l">l</code></a></dt>
<dd>Fix the Nintendo logo
(<span class="Ad">0x104</span>–<span class="Ad">0x133</span>).</dd>
<dt><a class="permalink" href="#L"><code class="Cm" id="L">L</code></a></dt>
<dd>Trash the Nintendo logo.</dd>
<dt><a class="permalink" href="#h"><code class="Cm" id="h">h</code></a></dt>
<dd>Fix the header checksum (<span class="Ad">0x14D</span>).</dd>
<dt><a class="permalink" href="#H"><code class="Cm" id="H">H</code></a></dt>
<dd>Trash the header checksum.</dd>
<dt><a class="permalink" href="#g"><code class="Cm" id="g">g</code></a></dt>
<dd>Fix the global checksum
(<span class="Ad">0x14E</span>–<span class="Ad">0x14F</span>).</dd>
<dt><a class="permalink" href="#G"><code class="Cm" id="G">G</code></a></dt>
<dd>Trash the global checksum.</dd>
</dl>
</dd>
<dt><a class="permalink" href="#i"><code class="Fl" id="i">-i</code></a>
<var class="Ar">game_id</var></dt>
<dd>Set the game ID string
(<span class="Ad">0x13F</span>–<span class="Ad">0x142</span>) 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.</dd>
<dt><a class="permalink" href="#j"><code class="Fl" id="j">-j</code></a></dt>
<dd>Set the non-Japanese region flag: <span class="Ad">0x14A</span> = 1.</dd>
<dt><a class="permalink" href="#k"><code class="Fl" id="k">-k</code></a>
<var class="Ar">licensee_str</var></dt>
<dd>Set the new licensee string
(<span class="Ad">0x144</span>–<span class="Ad">0x145</span>) to a
given string, truncated to at most two characters.</dd>
<dt><a class="permalink" href="#l_2"><code class="Fl" id="l_2">-l</code></a>
<var class="Ar">licensee_id</var></dt>
<dd>Set the old licensee code, <span class="Ad">0x14B</span>, to a given value
from 0 to 0xFF. This value is deprecated and should be set to 0x33 in all
new software.</dd>
<dt><a class="permalink" href="#m"><code class="Fl" id="m">-m</code></a>
<var class="Ar">mbc_type</var></dt>
<dd>Set the MBC type, <span class="Ad">0x147</span>, to a given value from 0
to 0xFF.</dd>
<dt><a class="permalink" href="#n"><code class="Fl" id="n">-n</code></a>
<var class="Ar">rom_version</var></dt>
<dd>Set the ROM version, <span class="Ad">0x14C</span>, to a given value from
0 to 0xFF.</dd>
<dt><a class="permalink" href="#p"><code class="Fl" id="p">-p</code></a>
<var class="Ar">pad_value</var></dt>
<dd>Pad the image to a valid size with a given pad value from 0 to 0xFF.
<code class="Nm">rgbfix</code> will automatically pick a size from 32KiB,
64KiB, 128KiB, ..., 8192KiB and give a warning thereafter. The cartridge
size byte (<span class="Ad">0x148</span>) will be changed to reflect this
new size.</dd>
<dt><a class="permalink" href="#r"><code class="Fl" id="r">-r</code></a>
<var class="Ar">ram_size</var></dt>
<dd>Set the RAM size, <span class="Ad">0x149</span>, to a given value from 0
to 0xFF.</dd>
<dt><a class="permalink" href="#s"><code class="Fl" id="s">-s</code></a></dt>
<dd>Set the SGB flag: <span class="Ad">0x146</span> = 3.</dd>
<dt><a class="permalink" href="#t"><code class="Fl" id="t">-t</code></a>
<var class="Ar">title</var></dt>
<dd>Set the title string
(<span class="Ad">0x134</span>–<span class="Ad">0x143</span>) 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
(<code class="Fl">-c</code> or <code class="Fl">-C</code>). If both this
and the game ID are set, the game ID will overwrite the overlapping
portion of the title.</dd>
<dt><a class="permalink" href="#V"><code class="Fl" id="V">-V</code></a></dt>
<dd>Print the version of the program and exit.</dd>
<dt><a class="permalink" href="#v"><code class="Fl" id="v">-v</code></a></dt>
<dd>Equivalent to <code class="Fl">-f</code> <code class="Cm">lhg</code>.</dd>
</dl>
</section>
<section class="Sh">
<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
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).
<p class="Pp">The following will make a plain, no-color Game Boy game without
checking for a valid size:</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbfix -v foo.gb</div>
<p class="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.)</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbfix -vcs -l 0x33 -p 0 -t foobar baz.gb</div>
<p class="Pp">The following will duplicate the header (sans global checksum) of
the game “Survival Kids”:</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbfix -cjsv -k A4 -l 0x33 -m 0x1B -p 0xFF -r 3 -t
SURVIVALKIDAVKE SurvivalKids.gbc</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<a class="Xr">rgbasm(1)</a>, <a class="Xr">rgblink(1)</a>,
<a class="Xr">rgbds(7)</a>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<code class="Nm">rgbfix</code> was originally released by Carsten
Sørensen 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
<a class="Lk" href="https://github.com/rednex/rgbds">https://github.com/rednex/rgbds</a>.
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">March 11, 2018</td>
<td class="foot-os">RGBDS Manual</td>
</tr>
</table>
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