You need to use a mount list. In particular, the following entries need to be set:
LowCyl = 0 ; there is no RDB
Device =
Unit =
Flags = 0; typically, depends on the device
SuperFloppy = 1 ; This turns on superfloppy support
DosType = 0x444f5303 ; for FFS INTL
FileSystem = L:FastFileSystem
Mount = 1
Activate = 1
The file system will figure out all remaining parameters from the device.
