Well, I'm not sure why yet, but when I switched to to using channel b, everything is working fine there. So, I guess it'll take a bit more work to figure out what's going on with that, but at least it's working.

At this point, it's likely a data rate or format error in your setup. Are you sure the terminal is running at 9600? If you're positive it is, then you need to verify that you are using the right number of data and stop bits, and that parity is off, unless the terminal is expecting parity (a rare ...

The DUART is the last thing I need to figure out how to program for...
You will need to write some setup values to CR for each channel, as well as MR1 and MR2. The power-on value in MR0 is good enough to get you started. You can later on tinker with MR0 to enable some additional features.

Don't ...

Have you read the "Driving the 28L91" document from this thread ?

ETA: The initialisation routine is at the end, and appears to rely on a table that is definitely incomplete.

Yeah, I have some code written that is based on that. I have been trying to put my own table together, and I've had some ...

Hi everyone.

I've been playing around with building some 65c02 systems since last fall. After seeing the work being done on the 8-bit guy's Commander X16 computer and playing around with programming a game in 6502 assembly for it ( https://www.youtube.com/watch?v=-Gw56Zh5yP8 ), I was inspired to ...