Museum of the Game® & International Arcade Museum® Forums

Hi forums,

I'm pulling my hair off with a Gallag (Galaga bootleg); Im dealing with glitches that might be one or multiple ICs. This is what is going on:

Text and sprites in the upright mode look garbled, but when the game rotate (or sprites rotate when dives) , it looks ok. It Looks like that is flipping partially and some pixel lines are stuck. I have been looking at the LS161s and LS86s, but without the schematics, it is challenging to understand the pipeline. The starfield seems perfect.

Here is a video of what's going on. Notice also the glitch in the pattern at the start. I'm flipping the screen by grounding the flip pin on an LS86.