does anyone know the reason why using entirely spr ports 2003 & 2004 (no dma)can cause problems in a game, as my 1k game had problems across a range of emu's - i used nintendulator when i programed it - so it worked on that, others had trival problems to big problems.
I was told by memblers that a game can still have problems using this method on the real thing, but work on emu's.
any ideas anyone?