magicianlord77
New member
Hi guys, my Championship Sprint is having graphical issues only in tracks 5 and 6:

The issue is color jailbars, all the rest of the game plays perfect. Here is track 6 from the test mode:

I've verified all roms from the board are good, and also using MAME and swapping roms narrowed it down to 7C (136045-1103.7c file), I've been able to almost replicate the issue by disabling some bits from it to simulate a bad data line. Looks similar (couldn't make them red), so when 7C rom is bad it affects the same areas my board has wrong. So I programmed another 27256 rom for 7C just in case but installing it made no difference

So I would say there is something wrong with my video board, but I'm not sure where to start, I mean looking at the schematics I guess the issue should be located at the "Playfield ROM" area, because if it was in other common area (like the Playfield RAM or Color RAM) it should affect other tracks not just 2 of them right?
Has anyone had an issue like this one?, what else could I check? Thank you!

The issue is color jailbars, all the rest of the game plays perfect. Here is track 6 from the test mode:

I've verified all roms from the board are good, and also using MAME and swapping roms narrowed it down to 7C (136045-1103.7c file), I've been able to almost replicate the issue by disabling some bits from it to simulate a bad data line. Looks similar (couldn't make them red), so when 7C rom is bad it affects the same areas my board has wrong. So I programmed another 27256 rom for 7C just in case but installing it made no difference

So I would say there is something wrong with my video board, but I'm not sure where to start, I mean looking at the schematics I guess the issue should be located at the "Playfield ROM" area, because if it was in other common area (like the Playfield RAM or Color RAM) it should affect other tracks not just 2 of them right?
Has anyone had an issue like this one?, what else could I check? Thank you!



