plustek: about Parport communication issues
Subject:
about Parport communication issues
From:
MRZ ####@####.####
Date:
7 Jun 2001 20:12:51 -0000
Message-Id: <20010607201245.LCCM10025.femail4.rdc1.on.home.com@mustang.pct.com>
> Gert Menke wrote:
>
> > Hi!
<snip>
> > And doing something else while scanning does not seem to slow down the scanning
> > speed.
> >
To which Mark Bratcher replied:
> This appears to be one of those YMMV things.
> I have a 9636T on a Pentium II/233MHz system. It simply won't work with EPP
> enabled. Gets a corrupted image every time. SPP works great. SPP was recommended
> to me by Gerhard Jaeger.
>
> Mark
I don't know about about that YMMV part; there may be more to this than than everyone thinks. I too have a 9636T, hanging off the pp of a debian potato (2.2r) box. While I have no "problems" using EPP mode, I have noticed some quirks. As it's a PIII-550MHz with 256MB RAM I wouldn't expect there to be a lack of resources, but when I'm anywhere in the scan process my system does seems to experience something of a slowdown and resources seem to get *absorbed*. When the scan process is totally over everything goes back to normal.
It is possible that this is a symptom of the same problem that causes a corrupted image for Mark. Perhaps in my case the additional system resources make the difference. In fact I think I've seen the kind of behaviour before in other unrelated areas. Specifically it had to due with how interrupts are handled, and might be caused by the way pp and IDE signaling work.
It isn't a problem at all for me so I've never gone that extra step; but it might be worthwhile to see what happens if the box is using SCSI storage media rather than IDE (IDE being where I've seen this behavaiour).
Marc.
