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RE: [Qemu-devel] Re: BIOS behaves different as real BIOS

From: Natalia Portillo
Subject: RE: [Qemu-devel] Re: BIOS behaves different as real BIOS
Date: Sat, 17 Jul 2004 07:45:36 +0100

Excuse me, where are the CMOS RAM values in qemu :? 

> -----Mensaje original-----
> De: address@hidden 
> [mailto:address@hidden 
> En nombre de Ben Pfaff
> Enviado el: sábado, 17 de julio de 2004 7:40
> Para: address@hidden
> Asunto: [Qemu-devel] Re: BIOS behaves different as real BIOS
> "Natalia Portillo" <address@hidden> writes:
> > I think that this is because the BIOS searches for the 0x55AA 
> > signature on last two bytes of first sector of disk.
> > As far as I remember, this signature was introduced very 
> lately and as 
> > far as I tested on my real systems, this signature is not really 
> > searched at boot time, and every DOS before 3.0 doesn't 
> have it (it is 
> > used also by later DOSes and Windows to identify a FAT 
> filesystem), at 
> > least on floppies
> You can disable the signature check by setting byte 0x38 in 
> the CMOS RAM to a nonzero value.
> --
> "...In the UNIX world, people tend to interpret `non-technical user'
>  as meaning someone who's only ever written one device driver."
> --Daniel Pead
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