Cheatcodes are used to pass values to KNOPPIX, to help with getting it working on difficult hardware. You type them into the boot screen, shown to the left, and press enter/return. The format is "kernel opt opt opt ...". Usually "knoppix" is the right selection for the "kernel", options as listed below (in Gnoppix is Credativ).
Example: "knoppix xvrefresh=60 noscsi floppyconfig"
You can type more than one cheatcode before press enter (i.e. knoppix lang=us knoppix xmodule=fbdev).
Note, the latest version of the Knoppix cheatcodes is always available here : http://download.linuxtag.org/knoppix...cheatcodes.txt