Recent content by channelmaniac

I have a Bad Dudes and probably a Crime City... https://docs.google.com/spreadsheets/d/1Ei2FuTX7uoG7dLKaTg6B26m0wWm2oSfIJbKQi3Tkcnk/edit?usp=sharing

NOPE!!! Didn't work. Turns out the video streaks badly to the right. Having to go to a Chinese seller on eBay to get it. The only other source I found was a chip broker and they usually want a minimum order that makes it not worth it. On the plus side, the Chinese seller has them listed for...

Clean the slot and the cartridge.

Nice fix! In all my Neo Geo repairs (log entries around 500...) I've never replaced a 7805. There's such little current draw for that in the 5v section that they don't even run warm.

I should've posted this for you: Every slot has 4 rows of chips supporting it. Those 4 rows repeat. If a chip on the 3rd row is missing a signal go up a slot to the 3rd row of chips.

Check the traces to the Backup RAM as well... If you have problems with the R/W, /OE, or /CE lines the CPU will not start up and you'll be left with the 'click of death'

Copper tape and an Xacto / Hobby Knife and you can quickly cut it to size.

High temp 2 part epoxy and copper trace tape will be what you need. The copper trace tape will not be sticky enough to hold on a cart edge connector. Clean all the sticky off with some Goof Off and Q-Tips. Cut it to size and mix up a very small amount of the 2-part high heat epoxy. Use a...

It's a corrosive oily substance. You need to use a good degreaser and a toothbrush to get it all off. Once clean you'll need to spend time checking trace continuity and patching.

I'll sell you one (MV1C) for $120 shipped to US addresses

OK... so you need a TSSOP packaged 5v flash chip and a small adapter PCB with castellated edges for soldering to the PCB. Not that hard to do. JLCPCB can make those PCBs. You'll need a TSSOP programming adapter for your chip programmer and make sure any read / write lines are held at the...

Post the pinout then.

Bah... use a multimeter on continuity and check the pins connecting that BIOS to the 68000 CPU. You can get the 68000 CPU pinout online. That will map most. Then you have power and ground pins... and chip enable.

Try Tayda Electronics. They are popular with the DIY Synthesizer crowd. https://www.taydaelectronics.com/catalogsearch/result/?q=4pdt

Have you reverse engineered a pinout of the chip on the MV1B yet?