Thank you for that link.

On Wed, 24 Jun 2015 19:10:23 -0400 John Hupp <>
> I'm working now with FreeDOS 1.1 on an old machine with a DFI P5BTX/L 
> motherboard with Intel 82430TX chipset, AMD K6/233, and 64MB.
> It has a USB 1 implementation, so I thought I would see if I could 
> get 
> some functionality out of it.
> Locating FreeDOS documentation on its USB support was a bit 
> difficult.  
> Searches tend to bring up outdated information.  There is an index 
> of 
> Technotes at, but 
> most 
> of those entries have just an article number with no title/subject.  
> There is a 1-paragraph summary at 
> that 
> provides some bare leads.  The most definitive leads came from 
> For my purposes I was only interested in open source, which narrowed 
> the 
> field down to one candidate: Bret Johnson's UsbDOS software at 
> His last update was in 2010, but there is some activity in the 
> forum.  
> His own assessment is that the overall state of the software is 
> alpha/beta quality, depending on which program in the suite you're 
> looking at.
> The suite includes some testing and support tools, and also a UHCI 
> driver and drivers for other common hardware: keyboard, mouse, 
> joystick, 
> printer, and hard/flash drives.
> One tool (USBHOSTS) identifies your host controllers so that you 
> will 
> know whether his software supports them.  His USBUHCI/L drivers 
> support 
> older Intel and Via UHCI controllers.
> Another tool (IRQ) aims to survey the current usage status of all 
> IRQ's, 
> whether each IRQ is enabled and what is (or commonly would be) using 
> it.  Perhaps I didn't try hard enough to understand it, but I found 
> the 
> results a little less than definitive.  [I would, in fact, very much 
> like to find a good tool for identifying used/free IRQ, I/O and DMA 
> resources.]
> I read through most of the informative and well-written 
> Though it was 186 pages and somewhat exhausting, I would much rather 
> have this state of affairs than the slim and spotty documentation 
> that 
> often comes with open source software, especially when it is in 
> earlier 
> development.
> One usage note that I don't remember reading in the DOC: For the 
> drivers 
> I was using, it was insufficient to simply put the program directory 
> in 
> the PATH.  It wouldn't work for me unless I did a CD into the 
> directory 
> before running anything.
> Speaking of running anything, the drivers are TSR's rather than 
> boot-time only.  So you can load and unload them as needed.
> And since my current first interest was in using flash drives, that 
> approach suits me well.  He also notes that doing USB in DOS is 
> memory-intensive, so that is another good reason to load as needed.
> I got the drivers for the host controller and USB drive running. 
> They 
> both loaded automatically into upper memory.  You can, by the way, 
> load 
> drivers first and then insert a flash drive, or insert a drive first 
> then load the drivers.  My commands were simply:
> USBDRIVE /Devices:2 /Disks:2 /Drives:2
> Testing with a SimpleTech 1GB FAT16 and a Kingston DataTraveler G3 
> 4GB 
> FAT32: I found that it works, but very slowly.  A DIR command takes 
> 10-15s.  Copying a 10KB file took perhaps 20-30s.  Copying a 500KB 
> file 
> took perhaps 10 minutes.
> But the data integrity seemed good.  The small and larger file 
> copies 
> both opened fine.
> About copy speed: USBDRIVE has a MaximumSectors option which can be 
> set 
> from 1 to 64.  By default it is set at 1, the slowest but most 
> reliable 
> level.  The developer uses 4 with his drives.  I got an error during 
> a 
> copy using 4, but with 3 no error.  Set at 3 and doing a more 
> accurate 
> test, I copied a 50KB file in 90 sec.
> There is some issue with the DIR command.  A DIR of the Kingston 4GB 
> FAT32 took 16 sec, but a DIR of the SimpleTech 1GB FAT16 never 
> finishes.  It lists all the files and directories, then summarizes 
> xx 
> File(s) and xx Dir(s), but then hangs there and never returns to the 
> command prompt.  A reboot is required.

>From Dale Sterner - MS organic chemistry

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