Problem

Analysis

Solution

Your communications application works with a modem connected to a Super Serial Card, but not with a modem connected to the Apple IIGS modem port. You've already checked to be sure the port is configured properly by using the Control Panel Program.)

Your communications software is addressing a particular chip on the Super Serial Card.

Use a Super Serial Card or get a communications application designed for the Apple IIGS.

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Appendix B: Troubleshooting