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[Qemu-devel] Re: BIOS behaves different as real BIOS
From: |
Ben Pfaff |
Subject: |
[Qemu-devel] Re: BIOS behaves different as real BIOS |
Date: |
Fri, 16 Jul 2004 23:40:17 -0700 |
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) |
"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
Re: [Qemu-devel] BIOS behaves different as real BIOS, Antony T Curtis, 2004/07/17