English Amiga Board - View Single Post

jotd · 26 February 2021, 22:06

careful about

Code:

.\@        btst        #6,DMACONR
        bne.b        .\@

on some amigas, you need one more btst (before the loop for instance) or you could miss the busy bit (A1000 bug but also reported by non-A1000 owners)

(winuae doesn't have this problem)

BTW if you enable "blitter nasty", the "no loop" code probably only works from chipmem. From fastmem it just doesn't wait. So use a loop or a blitter interrupt chain.

26 February 2021, 22:06	#21
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,303	careful about Code: .\@ btst #6,DMACONR bne.b .\@ on some amigas, you need one more btst (before the loop for instance) or you could miss the busy bit (A1000 bug but also reported by non-A1000 owners) (winuae doesn't have this problem) BTW if you enable "blitter nasty", the "no loop" code probably only works from chipmem. From fastmem it just doesn't wait. So use a loop or a blitter interrupt chain.