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+<!-- retain these comments for translator revision tracking -->
+<!-- $Id$ -->
+
+
+  <sect2 arch="powerpc" id="invoking-openfirmware">
+  <title>Invoking OpenFirmware</title>
+<para>
+
+There is normally no need to set up the BIOS (called OpenFirmware) on
+&arch-title; systems. PReP and CHRP are equipped with OpenFirmware,
+but unfortunately, the means you use to invoke it vary from
+manufacturer to manufacturer.  You'll have to consult the hardware
+documentation which came with your machine.
+
+</para><para>
+
+On &arch-title; Macintoshes, you invoke OpenFirmware with
+<keycombo><keycap>Command</keycap> <keycap>option</keycap>
+<keycap>O</keycap> <keycap>F</keycap></keycombo> while booting.  Generally it
+will check for these keystrokes after the chime, but the exact timing
+varies from model to model.  See
+<ulink url="&url-netbsd-powerpc-faq;"></ulink> for more hints.
+
+</para><para>
+
+The OpenFirmware prompt looks like this:
+
+<informalexample><screen>
+ok
+0 &gt;
+</screen></informalexample>
+
+Note that on older model &arch-title; Macs, the default and sometimes
+hardwired I/O for OpenFirmware user interaction is through the serial
+(modem) port. If you invoke OpenFirmware on one of these machines, you
+will just see a black screen. In that case, a terminal program running
+on another computer, connected to the modem port, is needed to
+interact with OpenFirmware.
+
+</para><para>
+
+The OpenFirmware on OldWorld Beige G3 machines, OF versions 2.0f1
+and 2.4, is broken. These machines will most likely not be able to
+boot from the hard drive unless the firmware is patched. A firmware
+patch is included in the <application>System Disk 2.3.1</application>
+utility, available from Apple at
+<ulink url="ftp://ftp.apple.com/developer/macosxserver/utilities/SystemDisk2.3.1.smi.bin"></ulink>.
+After unpacking the utility in MacOS, and launching it, select the
+Save button to have the firmware patches installed to nvram.
+
+</para>
+  </sect2>