Ah, very insighful, thanks! Do you think replicating this would suffice then or is it more complicated? I'll write a little program then to test it. Slim chances but we'll see.

Also worried about the lines on the right, particularly the CSOUT. As I understand it is merely an indicator to the other ...

Here your go, I hope it's adequate. I have two clocks, one 1MHz driving the CPU and other things and one 1.8432MHz for the UART. As the CPU wants to read from the UART, R/W becomes HIGH and thus UART pin 22 (DISTR) is active. When writing, R/W is LOW and such DOSTR becomes active.

For a first effort, I’d suggest you find a 6551 [...] The bus interface will be much easier A lot depends on circumstances. If being able to use the chip that's already in your possession is a fairly high priority for you, bogrol, then perhaps you won't mind if its interface for 65xx isn't the ...

Hello!

I have recently started building a 6502 SBC and want to have serial capabilities but only could acquire a WD8250 https://datasheetspdf.com/pdf-file/606110/WesternDigital/WD8250/1 . Unfortunately the datasheet is smokey for me but could deduce the following from it:
- Data lines TO data lines ...