i have the schematic, if interested you can contact me off list. it's easy, and polarity doesn't matter as only transitions are sensed. you use the 2nd and 4th wires of a 4 wire jack on the phone wire side. there's a 50 ohm 1:1 transformer hooked to the phone wires, the other side goes directly to the serial output lines and to the serial input lines through a 1k resistor in series with each line on the computer side. i've taken them apart and found the info at ti.com in one of their application notes for their chips. they are however very widely available. if you only want to connect 2 machines, you can actually also use a printer cable to directly connect the two macs even if you are using appletalk.
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