I read quite a few Usenet posts last evening on this subject, most from the late 80's. It looks like co-operative multitasking is going to be the way to go, unless one can get a card to generate interrupts every once and awhile. A program known as Daemon uses the Apple Mouse II card as its source of interrupts. Interestingly, the IIgs can be programmed, in software, to generate interrupts at varying intervals. Clearly, the superior system!