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Adding large disk support to INT13h (Users)

posted by bretjohn Homepage E-mail, Rio Rancho, NM, 02.04.2024, 16:54

> I am aware of this spec, but should have mentioned that my BIOS supports these
> functions. It sadly only makes available the first 8.4GB. The disk is also
> reported as 8.4GB disk by the BIOS. But other OS like OS/2 can for example
> access a 256GB disk without problems with appropriate drivers, so chipset
> support is given.
>
> Looks like I have to replace the INT13 routines
I think you're confusing some things. INT 13h _is_ the BIOS. So, when you say you're BIOS does support the extended functions, that can't be correct.

I think your problem is that you are trying to access the extended functions for the upper parts of the disk with CHS addresses instead of LBA and that won't work. I suspect that you do not need to replace INT 13h but just have the programs correctly use the INT 13h that's already there.

P.S.: Is LBA enabled in your BIOS/CMOS settings?

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