Help educate an old 8-bit assembler mindset

I had forgotten that this is about kernels, and thus always threaded. I have written threaded user-space programs, and written ancient 8 bit kernels which were not threaded, and once even modified one line in the linux kernel (some RS-232 control line) for my own use; but never combined those, and lost track of that aspect for this (lwn) thread.

Thanks to all concerned for my education.