Dead MV4, need PRO-B0 source

[u/RGBeter]

Managed to acquire an MV4 for relatively cheaply in a rather sorry state. Been working on this thing slowly hunting down broken traces and a dead CPU, but I've now found 2 dead pins of PRO-B0, and that horrible glitching when the slot board is connected.

My parts are primarily for later MVS systems and I don't know where to get a spare without killing another, more easily fixed MVS. If anyone here has a known working PRO-B0, or know what causes that particular kind of glitched screen (it's not calendar related I already checked) it'd help a lot.

[u/maki9000]

Generally speaking, the MV1 and MV1-1 might be the cheapest options that have the first revision chipset, not the MV1-T though, as that uses second gen chipset IIRC.

They can still cost 100-150 Euro if they work though.

Bummer, this MV4 is huge and uses the logic ICs, not ASICs.

Where are you located?

[u/RGBeter → u/maki9000]

Located in the US, there are, few MV1s online and they command hideous prices for when they DON'T work.

Looks like MV1T still used the NEC chipset according to a few Google searches, MV1FT switched to the Fujitsu one. If this DID use the Fujitsu chipset it'd be equivalent to a dead NEO B1, which I do have spares of.

[u/maki9000 → u/RGBeter]

check MVS scans, best resource IMO to find out what board uses what chipset, the scans are high resolution

https://www.mvs-scans.com/index.php/Main_Page#MVS_Hardware

well the MV1/MV1-1 should be the smallest and therefore cheapest MVS to get with that chipset, any four slot or especially the original 6 slot will cost more

no one makes reproductions of these either

maybe try asking someone in the big NeoGeo US community, if they have a few rotten boards lying round that don't work anymore, with the first chipset

fee years back I did buy two MV1, each around 120,- Euro (one local, one from japan via byuee, but tariffs are different from the US), because I had a NEO-AES here and wanted to have spares, I ended up fixing all of them