I will try directly connecting them tomorrow (or sometime in the near future) to see what that does. Hopefully the wiring is correct and won't require any swapping/the adapter.When the machines are connected together, you don't use any AT commands.
Connection settings are set within the menus of each program.
Once the wiring and settings are correct, characters typed on one terminal will appear on the other. At that point, you're ready to receive a file on the SE and send it on the Mini.
I loaded CQ II BBS and registered... first glance seems like an excellent treasure chest () for old computer users, especially in this case. I was able to get on using Kermit (at 19.2K baud!) and found ZTerm. Now how would I download ZTerm using YMODEM protocol?You'd be better off with a gurumodem, which allows you to FTP from the modem to your modern computer, save files to its SD card, then download via XMODEM or ZMODEM to your SE with your terminal program. I used this setup for quite a while before I set up a netatalk file server.
You could also get on CQ II BBS (cqbbs.ddns.net:6800) with your current setup and download just about anything you need from there! ZTerm is a much better modem terminal program and you can get it from the Mac Terminal Programs in the Downloads section. You'll wanna connect at more than 300 baud though!
I switched back over to QLII and tried to download using YMODEM-G, but the download quickly aborted and QLII started displaying garbage with the Mac beeping. (I also tried entering the"Receive File > Ymodem-G" prompt before starting the download, but it wouldn't let me press enter and kept "holding for header" with no flow.)
Also I had to create a second CQ II account because I had a typo in the username of my first one.