[Coco] Newbie doubt OS-9 Level 1 and the CoCo 2

[William Astle]

On 12-05-30 11:40 PM, Juan Castro wrote:
> I never used OS-9. Does it multitask on the CoCo 1/2? If so, how is it able
> to? CoCos, pre-Coco 3, didn't have timer interrupts. Was it cooperative
> multitasking?

The only requirement to do preemptive multitasking is a regular 
interrupt you can use to trap back to the system. A programmable timer 
is not required. All cocos have a 60Hz (50Hz in some countries) interrupt.