@McTrinsic, ye Lord of the Phoenix
I know you worked on getting your machine right for over 14 years, so this question will likely be hard to answer for you. But I thought I'd try.
Last weekend I wanted to move some files over from my PC to my Phoenix using my tried and true process of a null modem cable and Amiga Explorer. But for some bizarre reason I don't currently understand, the transfer would begin and fail in exactly the same spot every single time.
I could move 8KB of data over but then it would just stop. The data transfer was always incomplete.
I was going to try and flip a jumper later this week to see if the weird internal serial port has the same result. I'm actually hoping it does, because if that port works but the one on the back of the case doesn't, that would suck. But part of me wonders if the serial port - just like the internal SCSI - is a little sub-par? Like, maybe it requires a slower baud rate? I've been doing the 'default' transfer of 19200. FWIW when I use my serial port with a WiFi modem it seems fine. In those cases, I'm always chugging around 9600.
In any case, curious if you ever experienced issues with transfers via your own serial port?