From: "da Silva, Joe" 

Hmmm ...

I'm not sure how ISA cards fit into this picture. They
might not be one of the three standard USB controller
types - UHCI, OHCI, EHCI. Your chances are probably
better with a PCI card, and certainly better with an
on-board USB controller. Your chances of finding a DOS
driver for non-standard USB controller hardware is about
zero. I think there may be a way via a PCMCIA-USB adaptor,
but there you probably need to get _three_ drivers to
co-operate, which would reduce your chances of success.

The UHCI and OHCI controller types are of the USB 1.1
variety, and seem to have best driver support in DOS.
The EHCI controllers are USB 2.0 and the driver support
for these seems less mature.

My PC chipset (440LX) seems to be UHCI, which is ideal
for DOS, because this is I/O-based, whereas OHCI and EHCI
are memory-based, so I think drivers for these two types
require a memory-window to transfer data, typically in
the D000-DFFF segment, so there is less UMB available.

Joe.

> -----Original Message-----
> From: shadow{at}shadowgard.com [mailto:shadow{at}shadowgard.com]
> Sent: Tuesday, 28 June 2005 3:27 PM
> To: opendos{at}delorie.com
> Subject: RE: Fun with USB
> 
> 
> On 28 Jun 2005 at 10:10, da Silva, Joe wrote:
> 
> > Well, I see no reason why this wouldn't work for
> > any size USB drive. It treats USB drives like SCSI,
> > so I don't think the 512M/8G boundaries found with
> > various IDE & BIOS combinations apply.
> > 
> > Actually, I also tried the Iomega USB drivers (yes,
> > there are alternative drivers for DOS;-), but they
> > didn't work for me (perhaps these only work with
> > Iomega drives).
> 
> Well, I haven't tried sticking a USB card in the box I've got running 
> DOS. Yet. I do have an old ISA USB card I salvaged from a system we 
> upgraded for a customer once.
> 
> Wish I could find a Type II PCMCIA USB card for my older laptop. 
> 
> 
> --
> Leonard Erickson (aka shadow)
> shadow at shadowgard dot com
> 
> 
> 



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