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Sounds like every other 4 slot with the volume cranked way up... They aren't hi-fi.

Post a short video

Which cartridge boards do y'all recommend to put these ROMs on? I'd like to find a bootleg cart that I can redo into Shinobi.

Nice fix! Glad to help where I can.

This Mouser part should work: 913-C62256NLL55SNXIT Unless yours uses SOJ chips... Also, for that error you got, check pins 20, 22, and 27 for proper operation on both chips. One may be missing a signal. That could cause t he error message you're seeing.

U33 almost never fails. It will most likely need to be reflowed. I can do that for you. U13 is on the sound board and is a sound ROM. U33 is the Custom DMA chip on the main board.

Download the MAME ROM file for it off the internet, unzip the file, and program the chip file into a replacement EPROM chip.

Damn... the 322 are hard to come by... I probably have 25 to 30 of the 160. 080/801 are even harder to come by. I have just enough here to build another Power Up Baseball! prototype.

What EPROMs? I know a guy...

Welcome and greetings from Texas! I've been to your country twice, to Warsaw for work and enjoyed it very much. The food was incredible as I was there when wild mushrooms were being harvested. I brought back a lot of hand made ornaments from Bombkarnia too I also felt incredibly safe walking...

Dude! Awesome :D

Look for missing signals to the ZMC2... There's one that tells it which 8 bits to shif out and if it's stuck/missing, you'll get that kind of striped screen. It's one of the low numbered pins.

OK, when you power it up, how many bongs do you hear? Just one? When you turn the test mode DIP on and go into the sound tests, what sounds / effects do you hear OK? Which are bad?

Who wants to repair them? I'll do some work on them like replacing the 3 dead tactile switches, but I don't have a good source for the europin connectors to undo battery damage... I'm also not going to try to fix horribly corroded edge connectors. To me these represent a Q-Sound chip to sell to...

Have you replaced the supercap in the audio section?

Thanks, but I've only had to replace the A-01 and B-xx chips.

Now you see it... Now you see the other... I ordered "20 AMD 27C400 EPROMs" and received 16x Hitachi HN27C4000G-10, 2x Hitachi HN27C4000G, and 2x ST MX27C4100... Did OK on the lot and they came blanked. It did take some work to get all the paint off though. Overall, was a good buy...

Check connections between the A and B board near the Z80. If it can't connect properly to the sound ROM and the 2 SFX ROMs on the B board you'll have issues. Also check the sockets and those 3 ROMs for corrosion. Clean the legs of the ROMs if needed.

These are pins from the PALs to the chip on Crime City. I'm thinking one (pin 5) would be for a /CS (Chip Select) or similar function for accessing the I/O chip as that's an output on the GAL. Pin 11 is an input so it is possibly an /INT (interrupt) coming from the I/O chip. I haven't taken...

You probably have a Tantalum cap that is shorted. Common issue. An ESR meter can be used as a high frequency milliohmmeter to find the tantalum cap with the lowest resistance across its leads. If you have a multimeter you can check reisistance (with the power off) of the disconnected PCB to see...