What happens if the VBLANK int code takes too long?

[tryphon]

Is another VBLANK interrupt triggered while processing VBLANK code ?

In other words : do I have to stop Vints in my VBLANK interrupt routine ?

Sorry if this question sounds stupid, I have to make it clear.

[mikejmoffitt]

I don't remember if that is what will happen in that situation, but one solution is to have your vblank routine set a flag that vblank is active, which will let your main code spin on that flag until VBlank sets it, at which point your vblank logic can occur.

[Stef]

You don't need that, when the 68000 takes an interrupt it raises its interrupt level mask to the current interrupt level, meaning that only higher interrupt can interrupt current processing. A V-Int can interrupt H-Int process but not the contrary, also V-Int cannot interrupt another V-Int.