prc69
New member
Hi everyone!
I have a problem with my original Namco Galaxian board. It was modded with the four play roms and worked fine when I got it. But after two hours the video output was strange. I saw only the starfield ... no missle, no shells, no letters and numbers ... just the starfield and the stars are kind of flickering.
When I turn it off and on again I see the menu of the four play mod for the blink of an eye but then again nothing. The game plays fine (as far as I can tell). It coins, the sounds are all good.
I studied the shematics and checked the color prom which was dead on the inputs. The 74LS273 also dead on the inputs. I saw the 74LS174 on position 1U is missing ... I tried to put one in but that doesn't change anything.
I suspect some kind of timing problem. If only the color Prom was the problem I should see the missle and shells, right? Does somebody have a clue what could be wrong on this one?
cheers, prc
I have a problem with my original Namco Galaxian board. It was modded with the four play roms and worked fine when I got it. But after two hours the video output was strange. I saw only the starfield ... no missle, no shells, no letters and numbers ... just the starfield and the stars are kind of flickering.
When I turn it off and on again I see the menu of the four play mod for the blink of an eye but then again nothing. The game plays fine (as far as I can tell). It coins, the sounds are all good.
I studied the shematics and checked the color prom which was dead on the inputs. The 74LS273 also dead on the inputs. I saw the 74LS174 on position 1U is missing ... I tried to put one in but that doesn't change anything.
I suspect some kind of timing problem. If only the color Prom was the problem I should see the missle and shells, right? Does somebody have a clue what could be wrong on this one?
cheers, prc
Last edited:
