(I'm mainly putting this here so I don't forget...)

Steps to get NETBSD 1.6.2 Running on PowerMac 7500

 - install G3 Daughtercard.  60x processors are unsupported my friend
 - boot into MacOS on target machine (hope you still have macos on there!)
 - download apple systemdisk
 - apply "systemdisk-of105-patch.hqx" to the systemdisk
 - run the resulting system disk created in previous step
 - select openfirmware icon, click advanced, check off box next to video and keyboard.  check off "halt at OF" box (these are the bottom two checkboxes in the advanced window
 - ok, save, reboot
 - if you did the previous steps correctly you should see an OF (open firmware) prompt
 - at OF type "setenv real-base F00000"
 - at OF type "setenv load-base 600000"
 - at OF type "reset-all"
 - download netbsd macppc boot disk images (boot1.fs, boot2.fs) to unix box (you must have a dusty i386 somewhere eh?)
 - on unix machine make floppies with commands: 
        dd if=boot1.fs of=/dev/rfd0a bs=36k
        dd if=boot2.fs of=/dev/rfd0a bs=36k
 - put install floppy #1 in your mac and type "boot fd:0" at the OF prompt
 - do your install
 - after install goto utilites menu, /bin/sh
 - at shell prompt mount your harddrive.  Example command:
        mount /dev/sd0a /mnt
 - copy /usr/mdec/ofwboot to /mnt
 - issue installboot command:
        installboot -v -m macppc -t ffs /dev/rsd0a /usr/mdec/bootxx /ofwboot
 - you should see a successful "Writing Bootstrap message" if it worked
 - issue "reboot" command at shell prompt
 - OF prompt should come back up
 - at OF type "setenv boot-device scsi-int/sd@0:0
 - at OF type "boot"
 - BSD should come up in single user mode.  If it doesn't come up, make sure your real-base and load-base are still set correctly in OF
 - remount / in read-write with command:
        mount /dev/sd0a /
 - cd to etc and use ed command to edit rc.conf to say rc configured = YES
 - reboot
 - type boot at OF
 - if you got this to work you are displaying good hacking skills.  rock on.
     
Random Bookmarks:

        installboot man page:
                http://www.daemon-systems.org/man/installboot.8.html
        Google the macppc mailinglist:
                http://www.google.com/search?as_q=macppc&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_occt=any&as_dt=i&as_sitesearch=mail-index.netbsd.org&safe=off
        Fundamentals of OpenFirmware:
                http://developer.apple.com/technotes/tn/tn1061.html
                http://developer.apple.com/technotes/tn/tn1062.html
        NetBSD/macppc Frequently Asked Questions         
                http://www.netbsd.org/Ports/macppc/faq.html