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I found the problem code. Basically at the end of my H_Int routine I had this
; a5 = vdp control reg
- move.w (a5),d0 ; wait until it's out of Hblank
andi.w #1<<2,d0
bne.s -
- move.w (a5),d0 ; now wait until it's in
andi.w #1<<2,d0
beq.s -
The first one was the problem, my assumption is that the register is always set to be in Hblank. Thankfully, that check was actually useless for this routine, so now you can play Sonic 2 as god inten-
The text was updated successfully, but these errors were encountered:
To quote Malachi...
The text was updated successfully, but these errors were encountered: