Chip Source

[Witchboard]

Trying to resurrect a Prehistoric Isle 2. Does anybody know a source for the this chip on the CHA board or if a 90G06CF7050 will work?

 

[Xian Xi]

It's a custom chip so another cart with the same one.

Here's a list:

http://www.jamma-nation-x.com/jammax/mvsboardcodes.html

Look for the ones that have the same CHA board as PI2.

 

[Witchboard]

Nice source. Thanks Xian.

 

[DavidG]

I'm wondering if it's a bad batch of cmc's for the pi2's as I have had 2 go the same way as yours. The first one that died I sent back and it was returned with a note that I supplied the wrong voltage to the cart (which isn't true).

The two I have once a new cmc is dropped the games have worked fine since.

 

[Tyranix95]

...a note that I supplied the wrong voltage to the cart (which isn't true).

This PI2 kinda reminds me of a dead PI2 cart. that aaron6918 (KLOV) just pulled out of an MVS cab. and traded.

And connection?

 

[DavidG]

Not sure, when the first one went I was playing the game and thought the system was toast. It was a mv-1b in both cases. Later on I checked the roms and found them to be fine. It had nothing to do with the system just a bad chip. I swapped the cmc years ago and the cart has worked fine in the same 1b since.

 

[Tyranix95]

I know why...

Recently I saw a PI2 listing for a very nice PI2 cart. Trader stated that it was dead and wanted to trade it. Trader was also 99% sure that it could be repaired. I was wondering what was wrong with it. So, asked the seller couple of basic questions.

Q: How do you know it's dead?
A: I tested it in my four slot MVS.

Q: What did you see on the screen?
A: It was all white then I heard a pop. I think there must have been a power surge at some point thats why I dont think it would work.

That was it. I figured that there was probably something wrong with the power or with a cart board. I made 'em an offer: Took second place.

-----

Hey, some of the picts. posted on this site are really nice.

Was wondering what kinda camera and lenses equipment you all use to get these kinda picts?

 

[Witchboard]

Indeed, this is Aaron's old cart. I did some preliminary digging and figured the best game to sacrifice to resurrect the Prehistoric Isle 2 would be a KOF 99 as they are plentiful and cheap. However, the chip on the KOF 99 board I have for reference has a different chip number. I do not know if this is in reference to speed, date, revision or something else. It's a 90G06CF7050.

I too asked what was up with the cart and he responded that it must have been a power supply issue as after he replaced it, it worked fine. I would have thought that a power supply would more than likely damaged the main board rather than a cart, but it doesn't matter. If it was a power surge, there may be more damage than can be detected by visual inspection.

For the picture, I just used my Sony SteadyShot. Nothing fancy, just have to use a light and turn off the flash as it would blow out anything that close if used.

 

[Tyranix95]

.... I did some preliminary digging and figured the best game to sacrifice to resurrect the Prehistoric Isle 2 would be a KOF 99 as they are plentiful and cheap. However, the chip on the KOF 99 board I have for reference has a different chip number. I do not know if this is in reference to speed, date, revision or something else. It's a 90G06CF7050.

Hmmm...my KOF '99 has CHAF10, 1999.6.14

SNK
NEO-CMC
90G06CF7042
JAPAN 9932EAI
D0428AAH

 

[Tyranix95]

I too asked what was up with the cart and he responded that it must have been a power supply issue as after he replaced it, it worked fine. I would have thought that a power supply would more than likely damaged the main board rather than a cart, but it doesn't matter. If it was a power surge, there may be more damage than can be detected by visual inspection.

mmm....When told me he saw a white screen on the monitor and heard a popping sound, I was thinking of a problem with the the power platform, like the isolation transformer or a blown fuse, but not necessarily a problem with the switching power supply. I mentioned that to him. He didn't seem interested in re-testing the cart. I thought the cart. would still be ok--dirty contacts at worst.

For the picture, I just used my Sony SteadyShot. Nothing fancy, just have to use a light and turn off the flash as it would blow out anything that close if used.

Neat. I have to check that out.

 

[DavidG]

Any cmc will work in it's place. I used a ganryu to fix mine back when they were $10 each.

 

[Xian Xi]

If you can use KOF99 then it would be the best option since you can get them for $10-15 most times. Of course I'd just swap the roms and not the IC.

 

[Witchboard]

Of course I'd just swap the roms and not the IC.

I was thinking the same thing. When I get a replacement CHA board I'll look them over. I don't know if there are any jumpers or anything different between the two. Thanks all for your help.

 

[Tyranix95]

I have a second KOF '99.

It also has NEO-MVS CHAF10 1999.6.14

SNK
NEO-CMC
90G06CF7042
JAPAN 9932EAI
D0427AAJ

 

[JMKurtz]

I have a spare Kof99 board with that chip -- I can mail it to you. The board is free, just cover shipping...

Jeff

 

[Witchboard]

Thanks everyone for all the help. Hopefully we'll bring this one back from the dead.

 

[Hewitson]

If you can use KOF99 then it would be the best option since you can get them for $10-15 most times. Of course I'd just swap the roms and not the IC.

It'd be less work to swap the CMC!

 

[Xian Xi]

It'd be less work to swap the CMC!

To the more skilled and better equipped person of course.

 

[distropia]

obviously, if you have a infrared welding equipment, go ahead with the CMC.

I have a hot air reworking station and still is faster to change the CMC than desoldering 336 pins one-by-one.

Hey, by the way, what equipment do you have?

 

[Witchboard]

I have a desoldering iron and solder station. I do have access to a hot air rework station, but I am not yet confident in my hot air skills to remove a chip with that large a pin count without damaging it. I'll have to do it the long way. Not only that, but if it was an over-voltage issue that caused the problem, it's possible that more components than just the CMC may have been damaged.