These drivers were not free till very recently. But even though the source is available now, nothing about reuse and modification have been explicitly stated in the license. Otherwise it does ease the situation for FreeDOS... but not sufficiently enough.
---------------------------------------------------------- XMGR, UDMA and UDVD are DOS drivers for an 80386+ system running MS-DOS V5.0+, EDR-DOS, and all similar DOS variants.
XMGR is a DOS XMS memory manager. It can support V3.70+ UMBPCI by Uwe Sieber and is able to load directly in UMBPCI upper-memory. XMGR also runs with MS-DOS V4.49/V4.95 EMM386 or other equivalent "EMS managers". It is written to V3.0 XMS Specifications and can handle 4-GB of memory.
UDMA is a disk caching driver with internal support for UltraDMA disks. It intercepts and caches all DOS Int 13h I-O requests for BIOS devices. UDMA does caching for the UDVD driver and also supports other "external driver" cache requests. It uses HMA "free space" and can be loaded in only 1456 bytes of upper memory for up to a 250-Megabyte cache! UDMA sets its cache in XMS memory and caches from 5 to 750 Megabytes of data for diskettes, hard-disks and CD/DVD drives!
UDVD is a driver for up to 3 IDE CD/DVD drives which may be UltraDMA or old "PIO mode" models. It accepts file-input requests by SHCDX33C and other CD "Redirectors", and it also handles DOS "audio" functions. If "raw" CD/DVD input (audio, track-writers) is unneeded, UDVD caches data files by calling the UDMA driver, which greatly improves CD/DVD speed!
"Free use" source files are offered with the XMGR, UDMA and UDVD binary files. See their README file for full details about these drivers.
http://johnson.tmfc.net/dos/drivers.html ------------------------------------------------------------------------------- The Read-me says : "XMGR, UDMA, and UDVD are offered as "free software", as-is, and "use at your own risk", and with NO warranties, not even the implied warranties of MERCHANTABILITY nor of FITNESS for ANY particular purpose!
Driver questions or comments may be addressed to the website of Johnson Lam, johnson@tmfc.net."
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Best
A. Mani