benjgvps ... while the ClarisWorks Terminal serial transfer method would work on a PB 150 & iMac G3, it is far from the most practical. You are far better going with an Ethernet solution.
The mac128.com/terminal tutorial, may need to be clarified ... The KEYSPAN SERIAL to USB Adapter (or any such adapter) CANNOT BE USED FOR APPLETALK. Only SERIAL applications, like modems, printers, etc.
FYI, TheNixer, I did a search for just "Keyspan" on eBay and it pulled up lots of 'em. Since it seems the DE-9 serial adapters are so much more prevalent for about half the cost of the mini DIN-8 version, it would seem prudent to eventually figure out which cable works with it. Good luck with the buy-it-now auction.