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. On &arch-title; Macintoshes, you invoke OpenFirmware with Command option O F while booting. Generally it will check for these keystrokes after the chime, but the exact timing varies from model to model. See for more hints. The OpenFirmware prompt looks like this: ok 0 > 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. 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 System Disk 2.3.1 utility, available from Apple at . After unpacking the utility in MacOS, and launching it, select the Save button to have the firmware patches installed to nvram.