A long time ago, in Amiga past a company called C Ltd released a series of scsi controllers and a driver that allowed networking over the A500/2000/A1000 C Ltd.
I am not sure what the status of these things are currently (if the drivers would even work with the current version of AmigaDOS). However back in the early 90s (before the A3000) we actually had one of these systems working in the computer store I worked in.
