Recent content by Misos

The Unibios skip calendar errors. Side effect is that you can't save any game settings you change. Try the backup ram tests in the diag bios.

There's corrosion on the far right and left pins, use a fiberglass pen or a very fine sandpaper and see if gets any better.

Are all the SMD capacitors in the PCB 100nf? I remember it being mentioned here that it's better to replace them with better ones.

There is a short to ground somewhere, check the JST conector on p1 side.

You can split the c-roms and use 4x 27c800 instead if you don't have enough 27c160s (my case). C1 becomes C1 and C3, and C2 becomes C2 and C4.

Call me crazy, but I don't like Sengoku 3. Mutation Nation, 8 Man, Burning Fight, and Robo Army are ok but not great. Sengoku 3 plays nice, but it's repetitive, and the graphics didn't age so well.

Awesome work, I've made a copy to myself today. The MVS always lacked a good beat'em up.

That's why you practice in junk pcb before doing the real thing. You have multiple vias lifted. The wires that you used are too big for that kind of job.You applied too much heat in the pcb. It's good to have a soldering iron that you can regulate the temperature for that reason. Desoldering is...

Desolder and dump the M1. If you can't read it then replace it with a 27c010.

See my post and Furrtek answer on this other thread: https://www.arcade-projects.com/threads/pcm-replacement-programming-help-lc4128ze.24009/#post-359813

Yeah, the Furrtek replacement project for the PCM chip uses the same software. There is an old version of the software on archive.org but I don't know if it works.

After almost 1 month later: replacing the two chips solved the problem, the battery is holding the settings now.

I'm having the same problem, everything is receiving the 3.3v but after a couple days the CR2032 is gone, 0 volts. I replaced the 62256 memories, the problem persists. So I replaced the LS and the clock chip, let's see if it holds charge now.

Can you see any letters when you enter Unibios? A wild shot but maybe a deffective S1 could be affecting the entire game screen.

I've changed the p1 from a samurai shodown and done the same thing you did (double the p1) and I pretty sure Unibios checked all the crc as good.