GeorgeSpinner
Grand Master
Did you watch the video in this post?
It goes over using the cart in a 4 slot.
- Thread starter Mitsurugi-w
- Start date
I did not, but thanks for bring it to my attention.
I was using that method through trial and error. It works often, but about 30% of the time the MVS doesn't reboot and remains stuck on a black screen after the Multi messages (15m waiting but doesnt load). I did not check if the graphical glitches are less intense on slot 2/4, so perhaps thats already the solution to my main problem. I don't mind the "crash" chance.
However I'll dig through this thread to make sure Im not making obvious mistakes that I couldve avoided by just reading. Ill check my harness output as soon as the opportunity arrises
Hey @Darksoft, thanks for helping.
Here is a video of the issue. Attached are pictures of both layers of the PCB, the top of the PSU as well as a picture of the 5v output on the Jamma connector.
Thanks for your help!
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I believe from pin 3 on the JAMMA connector.
I can and will. Be right back.
With that said, any ICs I've ever seen that require 5v are good for +/- 10% voltage fluctuation. I'm surprised its an issue (well, I won't be surprised, who knows...). Anyway, adjusting, brb...
Turned down to 5.03v now. Tested and no change.
Indeed, 5.4v was really too much.
By dint of doing tests, at one point I had this kind of problem of a crazy screen with corrupted sound. To start, I think it's better to use an original bios and here is the protocol that I used to get out of it:
EDIT : If it doesn't work I'll repeat the protocol once just to be sure. If there's no improvement after that, no other idea.
By dint of doing tests, at one point I had this kind of problem of a crazy screen with corrupted sound. To start, I think it's better to use an original bios and here is the protocol that I used to get out of it:
- Remove the cartridge.
- Format the SD card and put back on it only the "games" folder (with its contents - as at the first launch).
- On the slot side, remove the battery (usually mounted on a support).
- Reset the RAM by starting the slot without a cartridge with all the dipswitches on ON (a white message on a black background should appear).
- Wait a minute before turning off.
- Return the dipswitches to OFF.
- Replace the cartridge on the slot (without the battery) and turn on.
- If everything is back to normal, turn off the slot and put the battery back in.
- Use normally.
EDIT : If it doesn't work I'll repeat the protocol once just to be sure. If there's no improvement after that, no other idea.
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Tried all of these steps. I get a "RAM TEST" page with no carts and all dips ON. I let that bake for a minute or two, formatted the SD card and setup /games/ and reinstalled.
I didn't swap out my Unibios though. Reluctant to do that unless I really have to.
No change sadly.
OK, that video was very enlightening. It's possible that when you switch to the 2nd slot, it's loading the DDR and the cart disconnects itself from the motherboard. I would try first running the cart alone in slot 1 and see how it goes.
You can also watch this explanatory video from @Mitsurugi-w about the 4-slots:
We're investigating but looks like some MVS models don't allow for enought current to the cart and that's why those glitches happen.
The test of running the cart alone, should tell you that the cart is OK. If it's still bad, try lowering the Voltage even more down to 4.8V, 4.7V, 4.6V at some point the glitches should dissapear and the cart work well if it's related to the motherboard not accepting more amps.
Please let us know how it goes and apologies for the hassle.
Just to be clear, regarding the behavior of the cart in a multi-slot system. I understand and totally accept that loading the cart might require a few extra steps to get it to behave. I was kind of expecting that tbh and its really not a problem.
Regarding the voltage. The potentiometer on the 5v rail bottoms out at 4.45v. The system won't post under 4.65v. At 4.65v with the MultiMVS in slot 1 and no other slot populated the issue is still present, identical to the situation at 5.4v. When the system first boots it drops directly into a test mode, as though no cart was installed at all. If I cycle to the "soft reset" menu and press B then the cart does boot to bad sound/graphics.
Happy to perform any other tests or suggestions you might have and no need to apologize. Shit happens. Hopefully we can fix it. Incidentally I did order a brand new fresh power supply. They're cheap and it will let me (hopefully) rule out the PSU. Also, I do have an oscilloscope. If you want me to look at anything on the MultiMVS board under load I can probably do that, if it'll help you troubleshoot problems other people are having.
EDIT:
I've now tried at numerous 5v outputs (4.65v, 4.7v, 4.75v, etc, etc) and nothing I've selected seems to resolve the issue. Out of curriosity, what amperage should I be seeing at the JAMMA connector? At the cart (not sure which PIN I should probe at the cart, but if you tell me, I'll solder a lead to the pin on the underside of the top board and try to get an accurate reading from the bus connector)?
Also, for grins I've gone and toggled every DIP in hardware and software on the MVH board and in the Unibios, to no avail. Although I have now just realized I enabled "Arcade Protect" mode on the Unibios so I can't get into the admin console anymore... whoops!.
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Madwindoman
Beginner
I cant seem to get cyborg force to run. Anybody have any success? I bought the dark soft rom from neo byte force. I added it to the games folder and it didn’t show up. Then I popped it in one of the homebrew folders and it booted right to the crosshatch screen. Not sure what else to try
Yes, you must actually put the files at the root of a folder like "homebrw1", "homebrw2"...
To exit Arcade Protect Mode, have you tried holding TEST + A + B + C when starting the slot? Or just A + B + C after setting dipswitch 1 to ON?
Yup, I got out of it pretty quick. Just wasn't immediately familiar with the procedure. A quick Google had me sorted and both methods you mention worked for me. Thanks!
Madwindoman
Beginner
Okay. So I put the contents of the cyborg force folder into one of the homebrew folders. Makes sense. Good lookin out man. Thank you!!Yes, you must actually put the files at the root of a folder like "homebrw1", "homebrw2"...
Plug_L'Exquis
Beginner
Hello everyone.
Just a message to give feedback on the cartridge.
I received it last Thursday, tried it the same evening and then all weekend. Everything works perfectly. I tried it on several slots (Mv1a, Mv1b, Mv1c, mv1f, mv1fz, mv1 the first one with the metal support), and they all worked. I had a little trouble at first but the problem was me, the micro sd was in 2 partitions and I hadn't seen because I wanted to go too fast
once the problem was fixed, I was able to take full advantage of it. Thanks to all the people who take the time to make tutorials or give advice, you make things move forward properly.
Just a message to give feedback on the cartridge.
I received it last Thursday, tried it the same evening and then all weekend. Everything works perfectly. I tried it on several slots (Mv1a, Mv1b, Mv1c, mv1f, mv1fz, mv1 the first one with the metal support), and they all worked. I had a little trouble at first but the problem was me, the micro sd was in 2 partitions and I hadn't seen because I wanted to go too fast
once the problem was fixed, I was able to take full advantage of it. Thanks to all the people who take the time to make tutorials or give advice, you make things move forward properly.FYI, this same behavior appears on all four slots, including Slot 1, with or without the other slots populated. It's almost like the Multi MVS isn't booted/ready when selected by the MVS.
Possible to fix this by supplying the needed amperage via a bodge wire?
I received a brand new PSU this morning. On the bench I turned it down to minimum 5v reading of 4.6v and then installed it. Under load it showed 4.4v and I slowly turned it up to 4.65v until the system booted with a known good game. Then tried the MultiMvs and it wouldn't start at all. Eventually got it to wake up at 4.8v but the graphical/audio corruption is present.
