English Amiga Board - View Single Post - A cautionary tale: trying to be 'too smart' with interrupts

hth313 · 27 November 2018, 06:09

I am not used to the blitter, so I do not understand if there is something strange going on.

But, I agree with @phx, the solution looks more dangerous to me. If it gets another higher priority interrupt between starting the blitter and acknowledging the interrupt, it could miss the blitter ready interrupt.

Also why do you post increment

(a0)+

when the next thing that happens is to restore

a0

from the stack?

27 November 2018, 06:09	#5
hth313 Registered User Join Date: May 2018 Location: Delta, Canada Posts: 192	I am not used to the blitter, so I do not understand if there is something strange going on. But, I agree with @phx, the solution looks more dangerous to me. If it gets another higher priority interrupt between starting the blitter and acknowledging the interrupt, it could miss the blitter ready interrupt. Also why do you post increment (a0)+ when the next thing that happens is to restore a0 from the stack?