Animating on the Interrupts?

The forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.

Rad Gravity

In the good ol' days of the amiga version of blitz (sigh), it was possible to animate a sprite on the interrupts. This meant that the clock cycles left to give the o.s. a breather were used to run the animation. This allowed (for example) a loading animation to show whilst files were being loaded etc.
I always liked this feature, any idea how to replicate it in blitz?