This is the much-sought-after DOS driver for the Hi-Val HSLM24A-00R External PC Card CD-ROM Drive. Although it has a weird file name, it's the Real McCoy, and worked like a charm for me. As always, peruse the "ReadMe" file carefully for the proper set-up instructions.
I'm also uploading esentially the same thing under the file name "Bootdisk", which says it's for an Addonics drive, but it actually contains the same drivers as for the Hi-Val unit, just with more detailed instructions.
So, get 'em and start booting-up, already!