Finally, at long last, the solution I was looking for. Want to use your Raspberry Pi as a SCSI device? Use RaSCSI, the solution to exposing your Raspberry Pi GPIO pins to control a SCSI connection. With this, you can emulate a SCSI hard disk drive and use that to boot any classic Macintosh that is equal to or newer than the Macintosh Plus. So, now you have two clear paths to creating the necessary boot disk to boot an older Macintosh.
-
Boot a newer Macintosh, either with the assistance of a modern device emulating a SCSI hard drive, or using a bootable optical disc (CD-R).
-
Now that your Macintosh is booted, write out the 400K/800K style floppy disk.
-
Boot your vintage Macintosh using it.
Alternatively, if you are really lucky, there is still one more final conversion path. Use a magnetic flux imager drive, such as Applesauce, to directly write out a Macintosh floppy disk from a modern computer.
With Raspberry Pi serial communications, and Raspberry Pi parallel
port via pi-parport, you’re pretty much all set to tackling anything
problem a vintage system may throw at you.
PLEASE NOTE: The original author of RaSCSI wrote the site in Japanese, and they didn’t use a GitHub account. The original site is long gone now, but luckily, it was picked up by the community and has numerous mirrors, some notable ones on GitHub.
20200720/DuckDuckGo rascsi
20200720/https://github.com/akuker/RASCSI
20200720/https://github.com/XReyRobert/RASCSI
This is also an important thread where folks from 68kMLA are discussing their own efforts at building from this design.
20200720/https://68kmla.org/forums/index.php?app=forums&module=forums&controller=topic&id=30399