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<h1>GXemul: PlayStation 2 emulation</h1>
<p>
<a href="./">Back to the index.</a>
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<p>The PlayStation 2 emulation is <font color="red">not working yet</font>. The focus is
not on making an emulator for running games, as there are other emulators
for that, but rather on making it possible to run NetBSD/playstation2. This page
contains <i>preliminary instructions</i> for how to experiment with NetBSD.</p>
<p><br>
<a name="netbsdplaystation2"></a>
<h3>NetBSD/playstation2:</h3>
<p><font color="red">NOTE: This doesn't work, and the <a href="http://www.netbsd.org/ports/playstation2/">playstation2 port of NetBSD</a> is not active at the time of writing this.</font>
<p>It was removed from NetBSD's tree in 2009, although a <a href="https://blog.netbsd.org/tnf/entry/the_playstation2_port_is_back">blog post from 2014</a> indicates
that it could possibly be brought back to life.
<p>
<a href="20100205-netbsd-playstation2.png"><img src="20100205-netbsd-playstation2-small.png"></a>
<a href="20190616-netbsd-playstation2-userland.png"><img src="20190616-netbsd-playstation2-userland-small.png"></a>
<p>To attempt to run the latest snapshot (from 2002):
<p>
<ol>
<li>Create an empty harddisk image, which will be the root disk
that the guest OS installs itself onto:<pre>
<b>dd if=/dev/zero of=nbsd_playstation2.img bs=1024 count=1 seek=3900000</b>
</pre>
<li>Download <a href="ftp://ftp.netbsd.org/pub/NetBSD/arch/playstation2/snapshot/20020327/binary/kernel/netbsd-GENERIC.gz">ftp://ftp.netbsd.org/pub/NetBSD/arch/playstation2/snapshot/20020327/binary/kernel/netbsd-GENERIC.gz</a> and run<pre>
<b>gxemul -X -E playstation2 -d nbsd_playstation2.img netbsd-GENERIC.gz</b>
</pre>
</ol>
<p>Then it hangs, waiting for keyboard input from a keyboard which doesn't exist,
in order to select the root device.
<p><font color="red">As a horrible hack, which probably doesn't really work,</font>
one could imagine setting <tt>root_device</tt> and
<tt>rootdev</tt> manually. For example:
<ul>
<li>Run with <tt>-p wdattach</tt> and get the second argument to that
function (register a1).
<li>Run again with <tt>-p setroot</tt>, and type something like:<pre>
<setroot>
ffffffff8002ad98: 27bdff20 addiu sp,sp,-224
BREAKPOINT: pc = 0xffffffff8002ad98
(The instruction has not yet executed.)
GXemul> <b>put w root_device, 0xffffffffc0016800</b> <-- the a1 value from wdattach
GXemul> <b>put w rootdev, 0x100</b> <-- ???
GXemul> <b>pc=ra</b> <-- to return from setroot without
GXemul> <b>co</b> keyboard interaction
</pre>
</ul>
<p>But there are timeouts and lost interrupts, so even if a correct disk image
was used, and the correct <tt>rootdev</tt> value was used, it is unlikely that
it would work yet.
<p><br>
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