Tutorials : CMVS

How to Consolize an MVS Board

  • In This Guide
  • Parts Needed
  • Enclosures
  • Stereo Sound Mod
  • Powering the Board
  • The Video Encoder
  • Adding Controller Ports
  • Adding a Unibios
  • RGB Output Socket(AES) Style
  • Extras??
  • In This Guide

    In this guide I will show you how to consolize an MV-1C MVS board. What is consolization you ask?

    Consolization is basically turning an arcade board which is made to be played in an arcade cab playable on a regular TV with control pads just like any other home console, hence the term "Consolization". The difference between a CMVS and a supergun is that a CMVS is a "dedicated" supergun that only plays MVS games.

    This is where you ask yourself "Do I want to make a CMVS or a supergun?". You decide.

    Parts Needed
  • Wiring (I use 22 awg usually)
  • Solder (I prefer leaded 2% silver)
  • Soldering Gun
  • Audio, Video and Power Jacks (I use color coded Gold Panel Mounts)
  • RGB > NTSC Video Encoder (I prefer the Neobitz)
  • +5v DC Power Supply (I prefer to use a PSU capable of 3 amps)
  • Power Switch (Rocker style or anything that can handle at least 2 amps. Do NOT use momentary push buttons for power.)
  • Dremel or Xacto Knife for cutting
  • DB15 Controller Ports
  • Ice Cold Beer (After Completion)
  • Enclosures

    For enclosures it is all up to you, you can either do an "Open Face" CMVS which is a bare board with no fancy enclosure or a fully cased CMVS. Keep in mind that putting an MVS board into a case can be difficult and also may take you a while to find an enclosure you like.

    Several companies make plastic, wood and metal enclosures. Hammond Manufacturing makes both plastic and metal ones. Other companies like PacTec only make plastic ones. Some CMVS builder have used Plexiglass, old PC cases and even NGH and NeoCD cases. Making an "Open Face" CMVS takes about 3-5 days to complete depending on cleanliness. An enclosed CMVS can take up to 3 weeks depending on difficulty with the casing material. However an "Open Face" 2 slot will only take you about 8 hours or less total build time, this is due to having everything you need already on the board and all you need is a PSU and RGB > NTSC Encoder.

    Stereo Sound

    The MV-1C board does not give Stereo Sound off the jamma edge so you will need to tap the sound directly from the chip to achieve Stereo Sound.

    **You do not need to remove anything to achieve stereo sound but I remove these components to help with clearance when I put them in an enclosure.

    First, you need to remove the heat sink on the board. That is the big silver thing on the bottom right corner of the board. You can remove it by either desoldering it or just clipping the legs. I don't ever plan on re-using them so I just cut the legs and then desolder the 2 posts holding it to the board.

    Click on the images for a larger view

    In Figure 1-1 is the onboard sound chip on the MV-1C.
    Gently bend back the surrounding capacitors to get to Pins 1 & 4. Solder a wire to each pin.
    Pin 1 is audio Left
    Pin 4 is audio Right
    ***UPDATE: Even though the datasheet says Pin 1 is Right and Pin 4 is Left, the audio is actually flipped digitally so the correct pinout is Pin 1 is Left audio and Pin 4 is Right audio.

    Here you can see that you can remove the following as they are no longer needed. You do not need to remove these to get stereo sound:
    - Caps AC5 through AC10
    - Cap C6
    - VR1 Potentiometer

    Powering the Board

    Powering the board is simple, you just provide +5v and ground. With the PSU I recommended all you need is a panel mount 2.1mm barrel jack which can also be purchased a Jameco. The barrel jack has 3 pins but you will only be using 2 of them. Remember that the PSU has positive tip polarity which means that the center pin will carry the +5v supply, the edge will be the ground. I always use a multimeter as a habit when doing it just to ensure everything is correct. Just mount the barrel jack and plug in the psu without wiring it to the board and use your tester to check which pin is which. Just remember that when powering your board with only +5v the sound will not come off the jamma edge as that is where the amplified sound is tapped to. You will need to find the source before it hits the amplifier, for an MV-1C this mod is shown below.

    Once you confirm which pin is the +5v go ahead and connect it to a power switch, you can use a rocker switch for this or whatever you choose. From there connect the power to Jamma PINs 3,4,C,D. And the ground to Jamma PINs 1,2,A,B.

    When adding a power switch, you will need 2 wires going to the switch. The switch needs to act as an interupt so when you flip the switch on and off it stops and starts the flow of the +5v to the board. See pic below.

    The Video Encoder

    The Video Encoder uses these signals: Red, Green, Blue, Sync, Video Ground and +5v.

    These signals are pulled from the MVS board at these corresponding pins:

  • Red - 12
  • Green - N
  • Blue - 13
  • Sync - P
  • Video Ground - 14
  • +5v - From Power Supply
  • Connect the above pins to the input on the video encoder. Take the wires from the output of the encoder and connect those to your Video jacks. Remember to connect the center pin on the jacks to the output of the video encoder. The video ground from the encoder connects to the outside of the jacks.

  • When testing your video using component, on some TVs you may notice that the picture doesn't display properly or is scrambled. This is due to the The Neo's horizontal sync which is around 59.18 Hz. NTSC spec is 59.94 Hz (not 60!) that makes it only 1.3% off, which is easily within an analog TV's much less an HDTV's tolerance. According to SNKNostalgia a simple 0.01uf Ceramic Cap on the sync line sometimes remedies this problem.
  • Please note that some LCD TVs may need different resistor values as for some the picture looks perfect on a CRT but on an LCD looked washed out. Standard values for an LCD TV use would be around 150ohm 1/4 watt on each RGB line. On CRTs you might not even need resistors but 80ohm should be fine.

  • RGB Output for the Purists

    If you don't plan on using encoders and just want RGB goodness, you should at least use an RGB buffer like a THS7314/16 or a THS7374. You can get PCBs for DIY assembly on OshPark or even find pre-assembled versions on ebay and all over the net. You would use the same RGB and Sync tap points as if using an encoder like shown above.

    Adding Controller Ports

    Above is a picture of a DB15 controller port viewed from the front side, the solder side will be opposite. Now for these projects you do not "have to" use these ports since you are making it your own. But if you would like to use your existing Neo Geo controllers you should use them unless you will also build a small converter that has a DB15 connector to convert to your custom pinout if you choose.

    Even though there are 2 pins that are used for the D button, only Pin 4 is used for 99% of the games. Pin 9 is used basically for the rare mahjong controller.

    Keep in mind that if you do not plan on using a Unibios you must wire up the coin buttons (Pin 16, T)to the select buttons (Pin 3) on the Neo controller. If you use a Unibios it makes the select button act as a coin button. If you do not want to wire it up to the controller you can add buttons on your CMVS for coins, I personally think that's retarded.

    The standard Neo Geo Controller pinout:

    Adding a Unibios

    A Unibios is an essential tool for your CMVS. One of the great things about it is that it lets you turn your CMVS into an AES with the console mode option.

    On an MV1C the Bios is a surface mount chip like the MV-1B, unlike the other boards with a socketed bios you will need to wire up a socket to add a Unibios.

    First thing you should know is that both chips have 40 pins BUT are not pin for pin as far as output. You will need to follow the pinout from the Unibios chip to the MV-1C bios. The MV-1B has a pin for pin connection(1-1, 2-2, 3-3, etc.) unlike the MV-1C as seen below.

    For this you will need:

  • (1) 40 pin 1024 socket
  • 28-30 awg wiring
  • Solder
  • Soldering Iron
  • Perfboard
  • Mount the socket to the Perfboard and solder it. From here you can either solder the 40 wires to the socket first or to the board. Some people use ribbon cable which is easier to use. Follow the pinout below to solder the pins correctly.

    Here is another image of the Unibios with corresponding pins from the PCB.

    *If After you connect the Unibios and it doesn't boot, you may need to bridge pins 38, 39 and 40. I've only had to do this on 1 board.

    *The MV1C can run off any MVS bios so you can do the socket mod and use another bios if you plan to get a Unibios later but want to do the mod now.

    Here is a picture of a completed Unibios Socket on an MV1C:

    **There is a new product called the NeoBiosMasta which elminates the need to do this mod. Cost is about $13 and saves a lot of time. I recommend it but if you are using an enclosure that only has so much clearance, wiring it like above may be the best bet for you. Please purchase the NeoBiosMasta or the Virtual Memory Card (VMC) from Neogeo Fan Club as he is the original creator and there are others profitting off of his hard work.

    RGB Output Socket(AES) Style

    For the RGB socket it is very simple. Just follow the pinout of the socket and tap the signals from where you were instructed to earlier in the DIY. The pinout labeled "Cable End" is the pinout which is what you would see on the solder side of the socket.

    The Pinout is:

    **Image Courtesy of Gamesx.com

  • Test Button - If board is enclosed it helps to have one on the enclosure BUT if you have a Unibios you do not need one. You can access the test menu via the Unibios.
  • Service Button - For what? A service button was used by operators to add credits without them being added to the revenue count in the banking feature. Other systems need the service button for navigate the test menus but the Neo doesn't.
  • Headphone Jack - It's up to you but you need to rig up something that turns it on and off so it doesn't create impedance issues with the RCA outs.
  • Vibration Feedback - If you figure this out, email me.
  • RGB Pots - Not really needed when using a Neobitz with 124ohm resistors as it is the middle ground when alternating between a CRT and LCD TV.
  • Guide by Xian Xi
    Some pictures provided by MKL the Neo Geo Mod Tech God

    Updated April 9, 2022

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