Re: Screen goes white while accessing drive

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#640

From: Pete Goodwin
Date: Tue, 15 Dec 1992 08:42

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In article <gilbertd.724342653@cs.man.ac.uk>, gilbertd@cs.man.ac.uk (David Alan Gilbert) writes...
>Hi All, Does anyone have the same symptoms?
> 
>I've got Risc OS 3.1, ARM 3 (Leading edge) Morley
>uncached SCSI card.  When I copy a lot of stuff
>from floppy to hard drive in say mode 16 occasionaly
>the screen goes white for a second or two - while
>accessing the hard drive.  I didnt think this
>should happen with an ARM 3 and I definitly
>thought it shouldnt happen on hard drives.

With an ARM2 and certain modes, accessing the hard disk would blank the screen.
Since the memory bandwidth is tight on certain 256 colour modes, RISC OS drops
the video in favour of data from disk.

With an ARM3 the situation is still possible - after all your main memory is
running at 8MHz (I assume you've got an ARM3 upgrade?), and it's still possible
to have tight bandwidths!

Pete Goodwin
goodwin@edieng.enet.dec.com

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From: goodwin@edieng.enet.dec.com (Pete Goodwin)
Subject: Re: Screen goes white while accessing drive
Message-ID: <1992Dec15.084519.29569@rdg.dec.com>
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Organization: Digital Equipment Corporation
Date: Tue, 15 Dec 1992 08:42:41 GMT
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