I purchased a bunch of games that the owner said did not work. In the batch were three Sachen games (Master Chu and the Drunkard Hu, Pyramid 2, and Olympic I.Q.). Everywhere I can see online, the Sachen games are supposed to be either blue or black cartridges, but these are gray. I tried to open them but the center screw under the label prevented me from doing so for Pyramid 2 and Olympic I.Q.
Master Chu, however, I was able to gently pry the end of the cart open enough to remove the PCB without removing the screw under the back label. Attached are photos of the cartridges, as well as the PCB for Master Chu. The Master Chu PCB has eproms (unfortunately, not protected with a sticker, and I think bit rot is what's causing the game not to work properly.. Level 2 is glitchy as hell) The other two, from what I can see by gently prying the shell open, have 60 to 72 pin converters in them. I couldn't tell if they have eproms without opening them, and I don't really want to damage the back label.
What do you guys think? Photos are here:
https://imgur.com/a/DFdpX/...
edited to fix the photos link