Mr do's wild ride video problem

[kynrek]

All the pins on the roms looked ok too

[seanyboyuk]

It cant be the monitor or cable as they are giving a picture, could be a corrupt board thats all i can think it could be.

[SubaruBrat]

Don't be so quick to believe the diags, they can miss lots of problems, it is just a way to catch some things. If it goes by getting a successful read it could be missing checksum validity, so you could be reading garbage. If it goes by checksum it could miss read issues, timing, etc.

[kynrek]

Don't be so quick to believe the diags, they can miss lots of problems, it is just a way to catch some things. If it goes by getting a successful read it could be missing checksum validity, so you could be reading garbage. If it goes by checksum it could miss read issues, timing, etc.

Scott, since the game seems to play fine and only has the vertical line issue would you guess ROM or RAM?

[SubaruBrat]

RAM would be my first go to. But other things can happen, if the lines came in after it warmed up maybe the GPU, but first off would be RAM

[kynrek]

RAM would be my first go to. But other things can happen, if the lines came in after it warmed up maybe the GPU, but first off would be RAM

Thanks Scott, I really appreciate the advice. I know there are no guarantees and RAM may or may not fix the problem but it sound like the best place to start.

[kynrek]

I found the RAM chips at http://www.questcomp.com they were $4.50 each for the faster MB8128-10 chips so I just ordered 6 of those (it was cheaper to order 5 or more) I might just replace all the ram chips at once.

[kynrek]

The 10ns chips seemed to make the game scramble when put in place of the 15ns chips do I ordered some 15ns chips as well to see if they will work instead.