On Wed, 15 Nov 2006 20:06:13 -0800, Jeff Liebermann
<jeffl@comix.santa-cruz.ca.us> wrote in
<v4onl25bho7sg2sbp1bledjnmf3h20lvsf@4ax.com>:

>John Navas <spamfilter0@navasgroup.com> hath wroth:
>
>>Only if the implementation is badly broken. USB has supported multiple
>>devices per port from the get-go.
>
>Yep. The problem is that I kept running into old hardware where the
>supplied drivers would only support one device per port. The docs
>accompanying the device warned that with a USB 1.0, only one USB
>device could be "used" at a time. This was on an old Acer desktop and
>printer. I don't recall the model numbers. When I plugged in another
>USB device into a USB hub plugged into the one port, the printer port
>hung. I've seen other such warnings about USB 1.0.
>
>However, you're correct. I thought it was something inherent in the
>USB 1.0 port. Apparently it's something in the device driver.

It could also be something in the hardware. Not only was early hardware
pretty bad on its own, but also the 1.0 spec suffered from a number of
problems, particularly in the area of hubs. A big part of 1.1 was
fixing problems found in 1.0.

--
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