From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2003-07-10 20:00:54
USB2.0 is a fraud in my opinion. USB 1.0 is the slow usb (dont remember,
1.5Mbps?), usb 1.2 is 12Mbps, and usb 2.0 was originally 480Mbps.
Customers were demanding motherboards with usb 2.0 installed on them, so
instead of making boards with EHCI (480Mbps) controlloers, they completey
redid the naming scheme. USB2.0 no longer indicates EHCI. Its name was
raped and applied to the USB1.2 12Mbps port.
My system, with its usb 2.0 ports at 480Mbps, can do about anything (my
usb2.0 hdd does 35megabyte/sec sustained transfers), providing you build a
controller capable.
As mentioned before, the use of a pic and some packet transfers would allow
one to talk to the 41 at any speed you like.
-David
On Thu, 10 Jul 2003 ncoplin@orbeng.com wrote:
> >> Does such a thing as a USB to generic parallel (not LPT) adaptor exist?
>
> >Yes, but due to the nature of USB I doubt that it will be able to fulfill
> >the timing specs needed by SC and similar transfer software.
>
> Maybe not with USB1.x, but maybe with USB2.0 which is 12Mbps?
>
> A typical LPT port write takes between 1us and 2.5us (from the range of PCs
> I've benchmarked). If a USB converter didnot have too mich overhead (not
> sure what these PIC, etc chips have), it might be in the ball park....
> mighten it?
>
> - Nick
>
>
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