i'm trying to remember now as my miggy has long since gone to a better home (imperial war museum running interactive FMV displays).
but as i remember it, this the NSDpatch file in the devs directory. the one that gets loaded with the ROM update for 3.5/9. have a scan through the file in a text editor, and in there you should find some hashed out lines for setting up large partitions on ther cybscsi deivce for the old mark1/2 cyberstorms.
just unhash the lines and change the cyberscsi.device for cybppc.device.
and if you can, when it comes to setting the type of file system to use with the drive, i found that the 3.5 version of HDtool boxdidn't like to write out the partition information correctly if it was anything other than an FFS drive. so i used the 3.1 version of HDtoolbox. this was much more reliable for setting up filesystems for anything other than FFS - PPC linux partitions included. make sure you load the PFS filesystem onto the drive and for clean drifves sake, remove the FFS filesystem auto loaded in there. now make sure you set the drive mask number if its not set correctly when you save the filesystem information to the drive, otherwise the drive will default to "custom filesystem" and not be available, as your miggy doesn't know how to read it.
then use the 3.5/9 version of hdtoolbox to setup the partitions. and bada bing, its there! took me ages to figure out but IT IS POSSIBLE! mooo!!!
anyway i cant remember this exactly. can anyone loan me a 2.5" to 3.5" drive adapter? i've just bought an 1200 and my backup 3.5" IDE drive is the only miggy drive i have left, and it has all my old system on it. so would be handy to sound like i know what i'm talking about :-D