Testbios help with nvidia 6800Gt and simple how to

Richard Smith rsmith at bitworks.com
Tue Oct 5 12:58:01 CEST 2004

Dave Aubin wrote:

> It seems my dd returned an unusable binary.  I found a good binary for
> The nvidia card from here:
> http://whitebunny.demon.nl/hardware/chipset_nvidia.html

I was wondering about your dd command that but I had not had a chance to 
respond yet.

This is what I use:

dd if=/dev/mem of=vbios.bin bs=1k count=64 skip=786432

That will rip the bios from 0x0c0000.  You can verify that you actually 
have bios there with

  'hd -s 0x0c0000 -n 256 /dev/mem'

in some cases it may be located at 0x0e0000 rather than 0x0c0000.

It should start with the 0x55aa (Little endian) or 0xaa55 (big endian) 
and futher on you should see some text identifying the bios.

Richard A. Smith

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