If you are using a IIgs and its modem port, the following is the right and proper cable. Pay attention Apple!!! Here is the correct cable pinout for the Apple IIGS modem port. DB-25 End Mini DIN 8 End ---------------------------- 2 <---------< 3 TX- 3 >---------> 5 RX- 6 >---------> 2 DSR (handshake in) 20 <---------< 1 DTR (handshake out) 8 >---------> 7 DCD 7 ------+---- 4 SIG GND | +----> 8 RX+ Ground RX+ to prevent noise pickup, it isn't needed for RS-232. Pin 6, TX+, is not connected to anything. Hope this helps, if you need more information, email mdavis@pro-sol.cts.com he's tthe best expert on GS telecom.