# Re: Mustek 1200SP: Missing Lines

Stefan Luettringhaus-Kappel (stefan@uran.informatik.uni-bonn.de)
Sat, 1 Nov 1997 12:37:50 +0100 (MET)

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On Fri, 31 Oct 1997, David Mosberger-Tang wrote:

> >>>>> On Sat, 01 Nov 1997 01:16:21 +0100, Joachim Woll <woll@physik.uni-kassel.de> said:
>
> Joachim> becka@rz.uni-duesseldorf.de wrote:
>
> >> This is really much ... What FW revision do you have ? What
> >> happens when setting backtrack=yes ?
>
> Joachim> Sane is reporting, that the firmware revision is 1.05Well,
> Joachim> when I set "force backtrack" within the graphical frontend
> Joachim> the problem seem to be fixed in gray scale mode. In color
> Joachim> mode the tree colors are vertically shifted against each
> Joachim> other.
>
> >> Ah. Seems to prove my guess that it happens at buffer boundaries.
>
> Joachim> Yes. I think so too...
>
> Did anyone have the dropped line problem before sane-0.62? In 0.62,
> the overlapped SCSI I/O was introduced for Linux which, if the problem
> is timing-dependent, could make a difference.
>

Yes, already in 0.4x. Also, sometimes lines are missing, and sometimes
lines are repeated, i.e. like 12342345.

Best way to see the error: print 45 degree one pixel lines at 300 dpi and
scan them. The error will be visible at every buffer boundary.

Regards,
Stefan

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