It's only when I boot with no floppy and let the "cf/hdd" ry to boot that the error shows up
you should have a look in your startup-sequence.... maybe there is a special peace of software for the Microbotics card installed which causes the blizzard to crash ?
something like this:
Write the following line in your Startup-
Sequence on the line following the Setpatch line:
SETXA ADDMEM
See your AmigaDOS manual for information on editing your
Startup-Sequence.
will be helpfull if you can post it here
