I had an Apple IIgs and a PowerMac G5 across the room from each other (still have the GS, but in the G5's spot sits a Mac Studio, now). To get files from the net onto the IIgs, I attached a Keyspan USB to serial adapter to the Mac, with the Mac-style miniDIN RS-422 connectors, and connected the GS to the Mac's serial port via RJ-11 using phoneNet adapters on each end. Worked great for filesharing to the GS. (I've got an ethernet card in the IIgs now, so I just FTP to the Mac (or wherever) to get files I want.)