Picked up two early stand-up video games (Asteroids and Centipede) from a basement in Cleveland. Would like to get them working and/or move them on to someone that would like them. First up is Asteroids and I could use some help.
Game boots, and in test mode I hear the tone when pressing each button. When a game is started game play seems to work normally (correct sounds and control operation) except for the monitor. I'm not quite sure how to describe this, but its as if the entire screen is compressed down to a single narrow vertical line in the middle of the monitor. That vertical line goes from the top edge of monitor to the bottom edge. We all know the ship appears in the middle of the screen. If I don't apply any thrust and just apply constant rotation while also firing constantly, I see the "bullets" traveling straight up and straight down along that narrow vertical line in the middle of the screen. The rest of the screen is completely blank, and the vertical line isn't solid white.
I tried to determine what monitor I might have (monitor manufacturer and model) by looking in the back access panel, but I could not tell - printing on labels and such is pretty faded. I did snap a few pictures though to post here as I know some of you can identify the monitor just by what the boards look like. Of course this thing didn't come with any papers/manuals.
Where do I start to diagnose this? I removed and re-seated the edge card connector and there was no change. Haven't done anything else. I'm a newbie when it comes to video arcade games, so feel free to post advice and links to resources a newbie can use to learn more.
Also, if anyone in the Cleveland area is interested in taking a look at these 2 vids then please shoot me a PM.