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Apple IIGS Serial Input



I have a device that has 3 wire RS232 serial. TxD, RXD, and Ground. I'm trying to get it to work with my IIGS. I succeeded in this 10 or more years ago and I forgot what I did. I have the 3 wires hooked up correctly, but I vaguely remember having to ground the handshake pins or the General purpose input pin or something. I've tried a bunch of combinations without luck. Any ideas?