Check this out:

http://http.info.apple.com/ftp/Apple_Support_Area/Apple_Software_Updates/US/Macintosh/System/Other_System/MODE32_7.5.txt

Ken

Bruce Anderson wrote:
> 
> Can anyone with one of the machines listed below verify that
> the Mode32 control pannel does indeed work with 7.5.5?
> ie. You can use more than 8MB of RAM under MacOS?
> BA-
> 
> > >Von: "Bruce Anderson" <brucea@wavefront.com>
> > >An: port-mac68k@netbsd.org
> > >Betreff: Re: need macos memory panel to boot!
> > >Datum: Die, 1. Sep 1998 23:54 Uhr
> > >
> >
> > >Sys7.5 and up, Does not support 32-bit addressing
> > >on the MacII,IIx,IIcx,SE/30 (030 Macs with dirty ROMs).
> > >You need to Install 7.0 or 7.1
> >