Re: Mustek 1200SP: Missing Lines

becka@rz.uni-duesseldorf.de
Thu, 23 Oct 1997 22:03:56 +0100 (MET)

> The Mustek 1200SP scanner was shipped with the DTC436E SCSI-Card.
> I was not able to get this card working on my system (Suse Linux 5.0,
> Kernel 2.0.30).
Known problem ... the card is ... *#$?%

However there have recently been some reports that it can be made working
somehow ...

> The scanner was then found by the Generic SCSI-Module. Everything looked
> fine, but there are some missing lines in the Grey-Mode In Color-Mode
> there are some horizontal stripes.
Yes. This is a known problem we are currently trying to sort out. It occurs
most visibly at medium resolutions at every SCSI-Buffer boundary.

> These problems are described in sane-mustek, but applying the fixes
> through mustek.conf did not change anything.
Setting the strip-height should affect the frequency of the stripes.

> are still there, but there were more before changing the scsi-cache.
Yep.

> So I guess that Problem is due to a corrupt data-transfer because of a
> timing problem or so.
I do not think so, as it always seems to be at the beginning/end of a
transferred buffer. So I think the last alignment between the current and the
next buffer is not quite right. I don't know, if this is a HW problem, or if
we are doing something wrong.

However the main developer of the Mustek drivers semms to be able to reproduce
this problems recently, so maybe there is hope ...

> I guess another SCSI-Controller would help, but first of all I am
> interested in getting the scanner work without buying new hardware...
No. You Controller is just fine. However I would recommend hooking the
scanner to a second card, as it doesn't seem to support disconnect and can
thus hog the SCSI bus for very long times. You may want to use the strip-
height option to limit this time a bit ...

Cu,ANdy

-- 
Andreas Beck              |  Email :  <becka@sunserver1.rz.uni-duesseldorf.de>

--
Source code, list archive, and docs: http://www.mostang.com/sane/
To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com