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Article #2 (51 is last):
Newsgroups: freenet.sci.comp.atari.product.8bit.tricks
From: aj848@cleveland.Freenet.Edu (Michael Current)
Subject: SS/DD and the XF551
Posted-By: xx004 (aa384 - Doug Wokoun)
Reply-To: aj848@cleveland.Freenet.Edu (Michael Current)
Edited-By: xx004 (aa384 - Doug Wokoun)
Date: Wed Jul  3 01:38:54 1991

The XF551 is capable of reading and writing all standard Atari 8-Bit disk
       810  SS/SD -  90K per disk
      1050  SS/ED - 128K per disk
            SS/DD - 180K per disk
     XF551  DD/DD - 360K per disk

But for some reason it has a little something against 180K mode.  

I discovered this when I found that many of my old DD DOS XL disks wouldn't
boot sometimes.  But once I got one loaded, they all booted with no problem. 
The problem thus occurs when the drive changes modes, into 180K mode.  It will
do it when told to, by MYDOS for example, but it probably won't do it at
boot-up time.  My solution is to boot up a MYDOS disk in whatever density,
change densities if I have to, then load whatever I wanted to from the DOS XL

A better solution would be to scrap DOS XL and install MYDOS everywhere, but 
this works for me.
Michael Current   '93                 Internet:         
Carleton College            Cleveland Free-Net:                  aj848 
Northfield, MN 55057                 telephone:         (507) 663-5181

[Editor's note: The XF551 does indeed boot in single density mode and only
changes when forced.  There was a program from ANTIC called XFCFG.ARC that
would create a file that, when loaded, forced the XF551 into double density.
The XF551 also supports a high speed transfer when in double density...
done by sending the SIO command with bit 7 set (in inverse video) - Doug]

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