Hi Sean,

Thanks for looking that up. I was totally bewildered why machine language would work, but Applesoft pokes would not. That may explain why the Third Millennium Arcade Board has its write register port at $C0C1 and $C0C3 and the read register port at $C0C1 so it could work from both machine language and also Applesoft BASIC POKEing. If you POKE to $C0C3, on the Arcade Board, the STA ($50),Y read is harmless.

I was trying to do a little demo with both the Third Millennium Arcade Board in slot 4 and the Super Sprite in slot 7 and both have them display something, Now I know why my POKEs were ineffective. Man, that was driving me bats.

Last edited by Golden Child; 09/24/17 01:40 AM.