I wrote some low-level tests to make sure the buffers worked properly before implementing the simplest system. A version of EhBasic running in 16KiB ROM (in the Pico) and 48KiB of the external SRAM with one serial port via the Pico USB connection. Runs at a bit faster than 2.5MHz without optimizations or overclocking of the Pico.

I didn't think I'd get it correct on the first try, but the PCB really works as intended, YAY!

I'll wrap it all up neatly and make a decent Github repository of code/PCB/docs before going back to porting Fuzix.