4-slot

[SOLUTION FOLLOWS] I gave up troubleshooting, put it all back together, and on a lark I slapped my Magical Drop 3 cart in a slot, and it worked! I didn't understand why. It turns out that UniBIOS v4.0 has a bug which can cause multi slot MVS machines to output: A black screen! (Along with some...

I picked up a cheap untested MVS 4-slot and have started to fix it up. It was one of the dirtier boards that I've dealt with and was full of graphical glitches caused by the material build up in the cart slots. This is an ongoing project, so I’ll post photos as I go. Before After First...