here a old link to Blizzard PPC settings
http://www.amiga.org/gallery/index.php?n=1918=10but there is another.
top left ( near the fan hole ) you can see a jumper which can be move to the left.
if i remove it,i will lose Fastram.
when jumpered to the right Fastram returns,but not sure what has changed. im still looking into this.