While Skymaster may not have a website, Intel does. Do a seacrh of the chipset used and you may find some suitable DOS drivers that are generic to the chipset used on the PCI card. Not a guarantee, but worthy of checking in to.
If that doesn't work, then you might want to look in the archive files of the drive manufacturer. When this was a common issue, you could often download a utility that loaded a CMOS supplemental utility in the background that extended the motherboard's ability to read drives larger than 8.4GB