RE: Polaroid Sprintscan 4000 connectivity

["gary" <gsellani@xxxxxxxxxxxxx>]

Most scanners use slower versions of scsi, and 8 bits at that. 

> -----Original Message-----
> From: owner-scan@leben.com [mailto:owner-scan@leben.com]On Behalf Of
> Paul Corsa
> Sent: Thursday, May 16, 2002 3:11 AM
> To: scan@leben.com
> Subject: Re: Polaroid Sprintscan 4000 connectivity
> 
> 
> The list must have forgotten the 80 and 160MBps SCSI versions? In 
> any event, most
> scanners don't need more than 20MBps, so the optimum choices are still
> SCSI-2(wide) or more current ; and Firewire; both much faster 
> than USB1.1. No
> current scanners output via USB 2 to my knowledge. Paul
> 
> "James E. Martz" wrote:
> 
> > OK.  I went to the Epson site to see what they had to say about 
> it.  They
> > have a PDF file on their documentation page at:
> >          
> <http://support.epson.com/hardware/scanner/per245/documentation.html>
> > called "Epson Answers (Scanners)" which addresses transfer speeds.  It
> > gives the following speeds for various interfaces:
> >
> > Standard parallel       0.115 MBps
> > ECP/EPP parallel        3 MBps
> > USB 1.1         1.5 MBps
> > USB 2.0         60 MBps
> > SCSI                    5 MBps
> > SCSI-2 (narrow) 10 MBps
> > SCSI-2 (wide)   20 MBps
> > Firewire (IEEE 1394)    12.5 to 50 MBps
> >
> > According to this, USB 2.0 is the speed winner and the way the 
> page reads,
> > I think I would be justified in being peeved if my Perfection 
> 2450 didn't
> > operate at USB 2.0 speeds if I had a USB 2.0 port on my computer.
> >
> > At 11:32 AM 5/14/2002 -0500, Laurie Solomon wrote:
> > >Jim,
> > >I probably should have prefaced that remark with "to the best of my
> > >knowledge."  :-)
> > >
> > >At any rate, I have found in many cases a claim to be 
> compatible with USB
> > >2.0 often means it will run off a USB 2.0 card but as a USB 
> 1.1; but the
> > >device itself is not usually 2.0.  While as time proceeds some 
> devices may
> > >be put on the market which actually are 2.0; but I suspect they will
> > >advertise in bold letters not "compatible with" but "USB 2.0." 
>  Today, most
> > >of the add-in  cards and even the USB portions of the newer 
> motherboards are
> > >2.0 with backward compatibility; but they are somewhat ahead of the
> > >peripheral devices that might connect to them.
> >
> > The page says that USB 2.0 is backward and forward compatible, 
> meaning that
> > a USB 1.x device will work plugged into a USB 2.0 port on a 
> computer, and
> > that a USB 2.0 device will work plugged into a USB 1.x port on 
> a computer -
> > only they will both work at the slower speed.
> >
> > >-----Original Message-----
> > >From: owner-scan@leben.com [mailto:owner-scan@leben.com]On Behalf Of
> > >James E. Martz
> > >Sent: Tuesday, May 14, 2002 7:34 AM
> > >To: scan@leben.com
> > >Subject: RE: Polaroid Sprintscan 4000 connectivity
> > >
> > >
> > >At 12:15 AM 5/14/2002 -0500, Laurie Solomon wrote:
> > > >Unless the USB card is one that utilizes the USB 2 standard, 
> it will not be
> > > >faster than the SCSI connection.  If it is a USB2 card, at 
> present there
> > >are
> > > >no scanners or any other peripherals that use USB2.
> > >
> > >My Epson Perfection 2450 Photo claims to compatible with USB 
> 2.0.  Can't
> > >tell if it actually operates at 2.0 speeds since my computers 
> only have 1.x.
> > >
> >
> > ****************
> > James E. Martz
> > Milan, OH
> > jemartz@earthlink.net
> > *****************
> >
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