I should add a little bit of a correction here. Make sure you change the modelid to 14 before you apply the 8.1 update. Otherwise you'll get the notification that says "This update is not compatible with your computer." As long as you have the empty .img file to load the OS files, you can take that route and watch as it prepares the necessary files and folders. After this is done, make sure you go to Special>Shutdown. You can now delete the older disk.img. Before launching the Macintosh desktop, rename whatever you called that empty .img (now containing the Mac OS 8.1) to disk.img.

Every time you add a new game, you might want to open basiliskii.cfg and add to each line: cdrom /home/pi/RetroPie/roms/macintosh/nameofgame.iso (or nameofgame.img). This way, the .iso or .img will show up as a disc on the desktop. You just need to double click on each disc, find the executable, and double click it. That should go through the install process, but sometimes you might have to drag and drop a/several folder(s) into a single game folder where your other games might be stored.

After some more experimenting, I noticed that after a clean install it would work the first time, but never again. Also, I noticed that if I set the refresh rate in the basiliskii.cfg file to dynamic (frameskip 0) and constantly moved my mouse it wouldn't give me the error. What would happen is the screen would turn completely white and then as I moved the mouse it would replace horizontal chunks with the emulator screen. I could do this until all of the screen was visible, but when I tried to shut down, the screen would go black, the mouse would invert color and I could not close the emulator or reboot.

@buzz Thank you for your attention! :)

@necrominog i am not sure. I would have to look into that. I use a real dvd drive in my setup. Did you look in the basiliskii config file?

@ret_1213

The files work fine for booting in... Basilisk on Mac.

If you haven't already, you'll also need to copy the information from ~/.basilisk_ii_prefs on your Mac to opt/retropie/configs/macintosh/basiliskii.cfg on the Pi.

@mediamogul I've been seeing this on the forum here about this mysterious basilisk config file that needs to be in basilisk but I haven't seen anything in the docs about this. Seems like the docs could use a lot more information about basilisk. Where can I find out how to create and use this config? I have my os 7.5.3 Macintosh img and rom working fine, all I'd like to do now is make it be 640x480 and full screen. If I do anything lower than 1600x1200 in the run command options or within the emulator using the screen settings, it displays in a smaller window in the upper left corner of the display.