OK, I've coded more on the multitasking scheduler and filmed a short video demo. Nothing fancy, but shows off what it can do at this moment. All the scheduler functions are available from Basic, so the demo is done in Basic. The threads are pure 6502 assembler. The SID-player at the end is a standard PSID binary played in a separate 64KiB environment. The text threads are given 8KiB each. Lots more memory to go :D