There's the PiSCSI which is a board that hooks in to a Pi's GPIO pins and acts like a SCSI interface to Macs. I have one and in addition to SCSI drives it can e

There's the PiSCSI which is a board that hooks in to a Pi's GPIO pins and acts like a SCSI interface to Macs. I have one and in addition to SCSI drives it can emulate a DynaTalk SCSI/Ethernet interface and use the Pi's wifi to talk to the Internet. I've done this with a Mac SE. It also will act like a AppleTalk file server using netatalk, it's an easy way to share files with other Macs on your local network.