[iyonix-support] Re: Lazy Task Swapping on Iyonix/RISC OS 5.11

On Wed 21 Jun, Eddie Lord wrote:
> 
> In message <4499668D.4070008@xxxxxxxxxxxxx>
>           Andrew Hodgkinson <ahodgkin@xxxxxxxxxxxxx> wrote thus:
> 
> > Paul Vigay wrote:
> > 
> >>> backdrop corruption:  Is this only seen on pinboards that use a picture
> >>> as backdrop ..
> >> 
> >> I guess I could run the machine with no pinboard for a little while (or a
> >> plain grey [built-in] one.
> > 
> > FWIW, I can't imagine any circumstances that would lead to the problem
> > showing up with a plain backdrop. All indications are that a rogue page
> > has been mapped incorrectly. If using a plain backdrop there is no
> > bitmap, compressed or otherwise, sitting in RAM that could be incorrectly
> > mapped. You will almost certainly still get pages mapped improperly but
> > they are unlikely to corrupt such visible data as a Pinboard image.
> > 
> > If the problem was corruption of screen RAM directly, wiping other
> > windows over the area would solve it. Other windows would be affected
> > too, since screen RAM has no "knowledge" of where windows start or end.
> > The fact that the incorrectly redrawn region is confined specifically to
> > the Pinboard sprite in the Pinboard window (in the visible case)
> > indicates a corruption of Pinboard's work area alone.
> 
> Interesting comment there. I quite often get a problem where I have to 
> 'wipe' a window around to clear part of the screen. To be specific, if 
> I hi-light a lot of text with the curser, for instance, sometimes this 
> hi-light does not disappear when clicking elsewhere, hence the wiping.

That doesn't sound like the specific problem PV is talking about, was it
!Edit you were using as your problem sounds like the old !Edit screen
updating problem that has been there since time immemorial!
 
> I'll pay more attention to the problem and see if there is some common 
> elements. (This with all the latest upgrades and mods, in a 3year old 
> machine)


Chris Evans

-- 
CJE Micro's / 4D                'RISC OS Specialists'
Telephone: 01903 523222             Fax: 01903 523679
chris@xxxxxxxxxxxxxxx     http://www.cjemicros.co.uk/
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