Re: Falcon, ST, AmigaOS et al
The ST and I think the Amiga had a 68000 and this did not support preemptive multi tasking, this was fixed in the 68010 onwards.
I agree about the sound chip in the ST - poor at best.
There was a non preemptive multitasking upgrade for the ST written by someone with no connection to Atari - I can't remember who wrote it but it was a one man job in about 1990. I just about remember his (usenet) post when he said that this is free to the world. Can anyone remember who this was? I used his multitasking for a few years and it was pretty good considering the hardware.