Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!husc6!ncar!hao.hao.ucar.edu!hull
From: hull@hao.hao.ucar.edu (Howard Hull)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: NTSC/PAL switch safe? One more time
Summary: Quite likely safe for 1 Meg Agnus
Keywords: 512K
Message-ID: <9144@ncar.ucar.edu>
Date: 11 Nov 90 17:53:41 GMT
References: <9063@ncar.ucar.edu> <1990Nov4.161456.9663@canterbury.ac.nz>
Sender: news@ncar.ucar.edu
Followup-To: hull@ncar.ucar.edu
Organization: High Alititude Observatory/NCAR, Boulder CO
Lines: 16

Well, John Davis posted the only comment I've received on this.  I have thus
come to the conclusion that it must be safe with an Amiga 500 or 2000 that
has the 1Meg Agnus installed to add a switch across J102 and to change that
switch while power is on (though as John points out, it will not likely be
detected until the next reboot).  I am also somewhat convinced that the
origin of the posted warning articles may be with respect to the old 512K
Agnus used in many yet-in-use earlier Amiga 500 and 2000 machines that have
512K of chip RAM and 512K C00000 of "slow fast RAM."  It is possible that
some of these users (maybe even with the 1 meg Agnus on hand but not yet
installed in the machine) began making the mods with the NTSC/PAL switch
mod first.  If you intend to both install a 1 Meg Agnus and add the NTSC/PAL
switch, and you want to check things out in steps, I recommend that you put
the 1 Meg chip in before you add the J102 switch, just based on the peculiar
origin of the warnings posted last year.  That's all folks...
							Howard Hull
							hull@ncar.ucar.edu