WARNING: nhale may cause really hard crashes, data loss, and general sanity loss if you try to understand all of the output.
Dump your rom in Linux and print info about it. Use the -r option if your videobios is hidden (i.e. not available on the EEPROM).
You need linux, an nvidia gpu, and the closed source nvidia drivers (binary blob).
Currently works mainly with 6/7/8/9 series. Partial 5 series and before support. Partial GT2XX and Fermi support.
Credit goes to the original author Roderick Colenbrander.