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From: ecwu61@castle.ed.ac.uk (R Renwick)
Newsgroups: comp.sys.acorn
Subject: Re: MODE 21 & MULTISYNC
Message-ID: <7681@castle.ed.ac.uk>
Date: 7 Jan 91 12:02:33 GMT
References: <1990Dec21.031201.3334@odin.diku.dk> <1990Dec21.101354.1261@urz.unibas.ch>
Organization: Edinburgh University Computing Service
Lines: 25

>In article <1990Dec21.031201.3334@odin.diku.dk>, seifert@freja.diku.dk (Michael Seifert) writes:
>> Hi All,
>> 
>> I have a problem with Mode 21 and a multisync monitor. My machine is
>> configured 

>>   When I access the (floppy) diskdrive in mode 21, my screen will turn "black
>>   with a small gray border" several times. It seems to me the it goes black
>>   whenever information is read from the diskdrive.
>

	This is quite normal.  The machine can't refresh the high res
screen modes while maintaining the data tranfer rate needed for the disc
access.  So the screen is not refreshed while data is being transferred
from the disc.  If I remember correctly, even the old Electron did this
in some modes.

	The only time you shoulf worry is if the same thing happens in a
lower res mode such as 12 or 15.  Have you tried mode 20?  I can't
remember off hand if this is low enough to avoid the screen blanking.  I
must admit, I find it rather annoying at times, but you get used to it
after a while (so I am told).  I don't know of any way round this other
thans changing modes.

Rik