Proud owner of an Alhambra 2C, Suzuki guitar (SSH) with floyd rose, Aria STB bass, Epiphone Sheraton II and Fender lite ash telecaster, Fender Hot Rod Deluxe and a Boss GT-8
I don't think you can really "enter" it. All you can do is flash it to a new version on some cards, allowing you to overclock it, or enable some hardware that has been disabled by the default BIOS.
AMD AthlonXP 2600+ Thoroughbred B @ 200x10.5
Shuttle AN35N nForce2 Ultra 400
2x512MB Kingston PC3200 (3-3-3)
ATI Radeon 9600 Pro
40GB WD ATA-100 8MB cache
Creative 12X DVD Drive
Memorex 52X CD-RW
Running Windows XP Pro