Hi,
I have just spent a few weeks bringing an old ColecoVision back from the dead. It was a flea-bay purchase and had a dead power supply, faulty video memory, a dodgy power switch and a broken cartridge connector!.
Anyways, I have replaced the memory - now 5V only, repaired the power switch, replaced the cartridge connector and it now runs OK from a 5V power supply with a 5V to 12V (Pololu U3V50ALV) up converter inside the case.
The problem I now have is that I am getting vertical lines on the sprites as shown in the attachments. Its fine when the games startup in text mode but appears as soon as a sprite is present.
I have attached some photos of the problem.
Can anyone help and point me in the direction of the problem please?
Thanks very much for your help.