This section will walk you through pre-installation hardware setup, if any, that you will need to do prior to installing &debian;. Generally, this involves checking and possibly changing BIOS/system firmware settings for your system. The BIOS or system firmware is the core software used by the hardware; it is most critically invoked during the bootstrap process (after power-up). &bios-setup-i386.xml; &bios-setup-powerpc.xml; &bios-setup-sparc.xml; &bios-setup-s390.xml; If you have no PS/2-style keyboard, but only a USB model, on some very old PCs you may need to enable legacy keyboard emulation in your BIOS setup to be able to use your keyboard in the bootloader menu, but this is not an issue for modern systems. If your keyboard does not work in the bootloader menu, consult your mainboard manual and look in the BIOS for Legacy keyboard emulation or USB keyboard support options. Some OldWorld Powermacs, most notably those with the control display driver, may not reliably produce a colormap under Linux when the display is configured for more than 256 colors. If you are experiencing such issues with your display after rebooting (you can sometimes see data on the monitor, but on other occasions cannot see anything) or, if the screen turns black after booting the installer instead of showing you the user interface, try changing your display settings under MacOS to use 256 colors instead of thousands or millions.