Consolized MV-1A - Metal Slug random crashes (161 on 1)

Joined
Nov 24, 2018
Posts
8
Hi all,

First post (with a problem sadly) - I’m having problems with Metal Slug on a 161 in 1 cart, on a MV-1A. It seems to crash semi-randomly on the first level maybe about 50% of the time. In contrast, Metal Slug X on the same cart seems fine, as do the other games I’ve tried.

I got the MV-1A board from an eBay seller last week (I had been expecting a MV-1B, but got an ok condition MV-1A defaced with “China Warning Sale” scored into the plastic and painted white, which makes it difficult to ignore!).

I’ve done the 5V only mod and stereo mod, and got RGB + sound hooked up via SCART to my old Panasonic CRT. Power is a 5V, 2.4A power supply.

Wasn’t sure what to do about controllers, since I didn’t want to buy anything until I knew everything worked, and didn’t want to butcher any of my existing controllers… In the end I decided to wire up a SNES controller to it via an arduino microcontroller which decodes the serial output of the SNES controller to the JAMMA connector. Seems to work well (I can post a schematic + code in another thread in case anybody else fancies trying this) and it leaves the SNES controller in original condition.

I also got the 161 in 1 cart (looks like v2) from eBay, and this seems to work ok (apart from the sound seeming a bit off at points in a few games) - all apart from Metal Slug.

Tried resetting the backup RAM - no difference.
Power supply - maybe not supplying enough current? But the other games are ok.
Broken cartridge - maybe theres a bad solder joint on one flash chip?

Oddly, I'm pretty sure that metal slug was working ok before I did the 5V and stereo mods, but maybe I just got lucky those times.

Anybody got any ideas?

Rob
 
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superfry63

Kuroko's Training Dummy
Joined
May 13, 2018
Posts
76
Hi Rob,

Welcome to the forums.

Before doing anything I'd apply the fixes for the 161 in 1 Version 2 cart. Sounds like your cartridge slot is fine, but if you have any deoxit clean it again.

http://www.neo-geo.com/forums/showt...-120-in-1-138-in-1-161-in-1-and-others/page11

You can solder x2 pins together on the cart which has fixed crashes for users and open up the cart and do GadgetUK's fixes. (add caps and etc)

Might need to reflow some solder, but also check that none of the pins on the chips are bridged - my 138 in one had a ton of bridged pins.

I have a MVS1FS and the 161 in 1 V2 and it's pretty much mint now.

Post a link to the PSU you are using?

Hope this helps.
 
Last edited:
Joined
Nov 24, 2018
Posts
8
Hi Superfry,

Thanks for your reply.

The PSU is this one:
https://cpc.farnell.com/ideal-power/15dys612-050240w-3/ac-dc-power-supply-5v-2-4a-vi/dp/PW04131
Wired into this socket:
https://cpc.farnell.com/lumberg/1614-09/chassis-socket-psu-500ma/dp/CN14799
I was a bit dubious about the socket, since it says both 500mA and 2A in the description. Maybe that?

I cleaned the cart slot with 99% IPA and got a bit of dirt out, but I don't think it's that.

I'm happy enough soldering, including SMT work, since I've made a few carts of my own (e.g. https://github.com/robinhedwards/UltimateCart/), but I'm slightly hesitant to modify this cart, since once I do there's no returning/exchanging it!

cheers,

Rob
 
Last edited:

superfry63

Kuroko's Training Dummy
Joined
May 13, 2018
Posts
76
Yea that should be okay. I figure if the socket was bad no games would be up to par.

Sounds like you have already covered most of what I suggested. I hear what you are saying about modifying the cart, but try the below - you just bridge x2 of the cart pins and it has been reported that it fixes alot of crashing for other users (I think mainly for x4 slots though)

you could always unsolder it and return it if need be.

https://wiki.neogeodev.org/index.php?title=161-in-1_Series_1
 
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