Problems installing OBSD 3.4 on IIsi

Hi,

I've got a Mac IIsi with 17Mb of RAM, and a Sonic 10BT/10B2/AUI network 
card.  It's currently running MacOS 7.5.

I've set it to 1 bit video, 32 bit addressing, and disabled virtual memory 
as per the install doc. I then setup an AUX swap + an AUX usr+root 
partition and and then formatted usr+root with the mkfs program as per the 
documentation.

However, when I run the installer, it immediately crashes with System error 
90.  I've also downloaded the 1.3 version of the installer from the 
snapshots utils directory, and it too crashes in the same place.

I've also tried running the installer with all extensions off, no luck 
there either.  I've also played with the minimum/maximum recommended memory 
in Get Info and gave it more RAM - same deal.


Incase it helps: from MacsBug it shows that it crashes on a MOVEM.L 
instruction which is trying to pop A0/D0 off the stack...


Any ideas?