AsantéTALK is a serial to ethernet bridge, but both Macs already have serial ports. (The PB1400 has a printer/modem port, and the G3 has separate modem and printer ports.) You need only AppleTalk enabled via those ports, and a serial cable (2 x MiniDin- 8) , and you are home. Make the G3 the 'server' for the exercise.

de