On holiday, but still coding in a few spare timeslots :)

The added SD-card reader works, files on FAT16/32 can be used now.

EhBasic with multitasking starts, still needs some more testing.

65C02 runs @1MHz with everything enabled on 133MHz Pico. SID emulation and mixing at 44100Hz, no filters. Only core 0 used so far. PIOs could probably be used to offload a significant amount of load by reading/writing the buffers.

Looking bright!

Now all the work left to get this up to snuff for a GitHub release.