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usb bios on Dell's Latitude D600


Hul Tytus

Jan 1, 1970
usb bios on Dell's Latitude D600

Dell's D600 boots from a USB/CompactFlash adapter when running MSDOS 5.0
with no Windows xxx included and shows expected USB capabilities of connecting
to a keybord or mouse with Windows XP running & probably plain MSDOS too. I'd
like to access these routines from a driver to be used under MSDOS, but
finding documentation for Dell's bios has been a bust.
If Dell has added the USB capabilities to bios in the same form as the disk
(13h) or rs232 interface (14h), writing a driver would be simplified. It would
seem likely, but Google showed nothing regarding access to the USB interface.
Anyone know if there is any documentation of Dell's USB interface? The only
code that's come to light so far goes directly to the PCI registers and not to
an IBM style bios.
The boot-time setup program on the D600 states the bios is version A16 and
the copyright statements are for Phoenix Technologies 1985-88 and Dell 1990-
2005 which would indicate the USB interface code is Dell's handy work.

Jasen - Ralf Brown's list showed no "bios interupt", that is
no USB interupt that machine manfucturer's have included in
their gear of the style IBM used on it's PC bios.
But, there was a description of some additions to the interupt 13h
disk interface that included a USB type "disk". Handy to know, even if not
of current interest.
Ralf also has a good bit of data on USB controllers, pci registers and
what apperared in brief passing, textual info also. For one (maybe more)
of the controllers, USB4DOS, access via interupt 2?h was shown for an
"installed" controller.
Checking interupt 2?h on the bios of various computers might be
interesting in the hope that others have used that interupt for the same


Ralf Brown's Interrupt List. Best DOS/BIOS refernce I've seen.