06-30-2022, 05:45 PM
What is Handyterm? Is this a custom program designed for a particular modem? You might try downloading CCGMS. If you have the right baud rate then you should see anything you type. The only exception to this would be if the CIA chip that controls the serial port is bad. You could try swapping the two chips (if they are socketed). Start with getting a known good terminal program first.