Steve Giannoni wrote:
> I've got :
>
> Intel(R) 82801BA/BAM USB Universal Host Controller - 2442
> Intel(R) 82801BA/BAM USB Universal Host Controller - 2444
> Iomega USB Bus Powered Zip 250
> NEC PCI to USB Enhanced Host Controller (B1)
> NEC PCI to USB Open Host Controller
> NEC PCI to USB Open Host Controller
> USB Root Hub
> USB Root Hub
> USB Root Hub
> USB Root Hub
> USB Root Hub
>
> 11 items and only one says "Enhanced"
>
> Comments ? ...
I would agree with Philo. You're good to go.
I would add a small caveat though. Your motherboard is possibly a
"crossover" board. USB2 existed at that time, but it was not
available immediately from Intel. Your Southbridge chip is
ICH2, and USB2 was introduced with ICH4 Southbridge.
http://en.wikipedia.org/wiki/I/O_Controller_Hub
To help out, some motherboard manufacturers added the NEC USB2 chip.
This is similar to the situation today, where NEC did the USB3 host,
before it was available on chipsets. Back in the day, a NEC USB2
chip was one of the first to host USB2 ports. A motherboard manufacturer,
wishing to add USB2 to the feature list, would include a NEC
chip on the motherboard, to take up the slack from the missing
feature on the Intel chipset.
When you look at the USB ports on the computer, some will
be connected to the NEC chip, and some will be connected
to the Intel ICH2. For best performance, you'll want to
use the NEC connector. This may be addressed in the documentation
for the computer. (They wouldn't think of actually labeling them.
For today's USB3, the connector color is used as a hint. But back
then, nada.)
A USB 1.1 connection will manage about 1 MB/sec transfer rate.
An external USB2 enclosure on a USB2 connection will manage slightly
better than 30MB/sec (versus the 60MB/sec promised by the bit
rate on the cable, which is never achieved in practice).
It's possible to use a program like UVCView, to evaluate what kind
of connection was negotiated. But it's a pain to find a copy of UVCView,
and a nuisance to describe how to interpret the config data in the right
hand pane. The Device Manager, as far as I know, doesn't show the
present connection speed. But you may get a dialog box presented by
the OS at some point, telling you that additional performance could
be achieved if you connect to a USB2 port. You may have to rely on that,
to distinguish one port from another.
I seem to remember one Asus board, may have mixed a NEC connector
and an Intel connector on the same "stack" on the back of the computer.
So you can't even rely on the stack arrangement, to pair together
"like" things.
Paul
>
> On Sat, 23 Apr 2011 14:13:03 -0400, "Jan Alter" <(E-Mail Removed)>
> wrote:
>
>>
>> "Steve Giannoni" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>
>>
>>> How would I know if the free USB port is USB2 ?
>> Go to the Control Panel, Click on the System folder, hardware tab then
>> Device Manager, and scroll down to look for Universal Serial Bus Contollers.
>> Expand that selection and look for "Enhanced Host Controller" or USB2
>> Enhanced Host Controller. If you see it you got it. If you don't see the
>> word "Enhanced" anywhere you don't have USB 2 on that computer.