On Fri, 17 Nov 2006 10:35:29 -0500, "Neil H." <not@home.today> wrote in
<44CdnTONvKdfS8DYnZ2dnUVZ_radnZ2d@comcast.com>:

>
>"John Navas" <spamfilter0@navasgroup.com> wrote in message
>news:js6ol29lpvlog18u2m0vgjruf93bjjg4dp@4ax.com.. .
>> 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.
>
>What I've read (somewhere, can't now recall the source) is that USB 1.1 was
>merely a "clarification" of the 1.0 spec, not an actual change. That isn't
>correct?

Not correct. See
<http://en.wikipedia.org/wiki/Universal_Serial_Bus#USB>.

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