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Thread: Introducing the Uni-Gen Converter!

  1. #1
    Video Game Modder Outrunner segasonicfan's Avatar
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    Megadrive Introducing the Uni-Gen Converter!

    Hey folks!
    So I've been working hard building a new website and designing some cool new PCBs! Thought I would share my latest invention, the


    Here is the new upgraded case version! Please see later posts for more updates!
    *New version 2.2018 includes:
    - 3mm plexi acrylic case
    - control knob
    - jumper for A button / Up (for C64 / Atari, so you can jump with the A button)
    - plug for optional A & Start outputs (for use with PC Engine board and other upcoming boards)



    NOW TAKING ORDERS

    This handy board lets you use a Sega Genesis controller to safely play on Commodore 64, Amiga, ZX Spectrum (with adapter), Atari, and SMS - pretty much any 1980's system with a DB-9 connector! You can also use it as a dedicated SMS controller adapter with autofire on your Sega Genesis/Mega Drive

    "but I can already plug in my Genesis controller and it works OK!" True, however Commodore 64 and some other systems are known to blow their internal chips because they were not designed for this. The Genesis controller sends +5V logic high across unused buttons (without a pull-up resistor) resulting in disaster for your console. It's risky, but some people keep on doing it and are lucky so far. and some people do a simple "diode mod" to fix the issue. However, all diodes have leakage currents that could still potentially harm the system.

    Enter the Uni-Gen Converter. This board corrects these issues 100% by keeping every ungrounded input to a floating / high impedance state, without diodes, and this is *exactly* what the systems are designed for! It is a FULL demultiplexer using only TTL logic which means ZERO lag time and perfect compatibility! It uses the same chips of the 1980's gaming era.

    What's more, it has adjustable auto-fire and remapping of the jump button (from the annoying "up" configuration) to the A button.
    Here's a simple breakdown of features:

    • Built-in Adjustable Auto-Fire feature
    • Mapping of jump (Up) to the A button
    • ZERO lag. No microcontroller
    • True-floating outputs when depressed: safer than the popular"diode mod"- will not damage your consoles!
    • Selectable solder jumper for SMS or other consoles
    • Selectable solder jumpers for swapping B and C buttons (when you want auto-fire on a different button)
    • Auto-Fire LED indication
    • short-circuit and reverse-polarity protection
    • Ultra-low power consumption
    • Fully compatible with both 6 and 3-button Genesis controllers (tested on official pads)
    • Start button support for installing inside a SMS / Game Gear or other consoles


    This board can be used inside a Sega Game Gear or Sega Master System to add start support for an external Genesis controller (it was designed to fit!) or for any other hacking project where you want to use a Genesis controller and have access to all the buttons demuxed.
    Note: If using the board to plug into a Genesis / MD you will likely need an extension cord like this one. This is due to the recessed jacks on the console which do not fit well with regular DB-9 connectors.

    PRICE: $49.00 USD
    BUILT 100% by hand in the USA - no sweat shop labor!
    PM me or you can purchase on my new website SEGASONICFAN DESIGNS

    Thanks for looking and long live the Sega hacking!
    Last edited by segasonicfan; 05-10-2018 at 02:06 AM.
    My Website:
    SEGASONICFAN DESIGNS

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  2. #2
    Death Bringer ESWAT Veteran Black_Tiger's Avatar
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    Does it work with Intellivision systems such as the Intellivision II and Super Video Arcade?
    Quote Originally Posted by year2kill06
    everyone knows nintendo is far way cooler than sega just face it nintendo has more better games and originals

  3. #3
    Video Game Modder Outrunner segasonicfan's Avatar
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    afraid not. Intellivision uses a specialized input system that no other console uses AFIK. It doesn't adhere to the standards (or even in the same ballpark) of all the other systems.

    -Segasonicfan
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
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    WCPO Agent CrossBow's Avatar
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    Does it provide two separate fire button support such as with the Atari 7800?

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    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by CrossBow View Post
    Does it provide two separate fire button support such as with the Atari 7800?
    It wasn't designed with the 7800 in mind (it has 2-button support for Amiga). However, from what I can tell the primary difference is that the extra button is on pin 5 (7800) instead of pin 6 (Amiga) so I could customize it to work for the 7800 with a single wire.

    -Segasonicfan
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
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  6. #6
    Mega Driven Raging in the Streets cleeg's Avatar
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    So, could this be used on a Megadrive console to provide autofire on it? One thing I'd love to have is autofire on my IR six button pads, my preferred controllers.

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    WCPO Agent CrossBow's Avatar
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    Quote Originally Posted by segasonicfan View Post
    It wasn't designed with the 7800 in mind (it has 2-button support for Amiga). However, from what I can tell the primary difference is that the extra button is on pin 5 (7800) instead of pin 6 (Amiga) so I could customize it to work for the 7800 with a single wire.

    -Segasonicfan
    Little bit more than that...yes it does use the two wires, but those wires also have actual resistors on them so the 7800 knows what is being done.

    See here:

    http://atariage.com/forums/uploads/m...1469570286.jpg

  8. #8
    For great justice! Outrunner Tor Landeel's Avatar
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    Very interesting! I'm spreading the word
    ***** トル・ランディール ******
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  9. #9
    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by CrossBow View Post
    Little bit more than that...yes it does use the two wires, but those wires also have actual resistors on them so the 7800 knows what is being done.

    See here:

    http://atariage.com/forums/uploads/m...1469570286.jpg
    ah, thanks. The resistor and pinout difference is OK but needing to use a different common pin instead of ground really switches things up a lot. It would be some work to hack this board to do it, though it is possible. A better solution would be for me to design a version solely for use with the 7800. I can do this if there is interest, say 10 people or so interested in a pre-order.

    Very interesting! I'm spreading the word
    Thanks!

    -Segasonicfan
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
    I offer free repair advice through public forums as a service to the community and as a repository of information.
    If you cannot post here, I recommend these places that don't have posting restrictions:
    https://nfggames.com/forum2/index.php
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  10. #10
    Raging in the Streets xelement5x's Avatar
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    Cool idea. I've actually got an X68K to Genesis adapter I've been needing to build as well and this would be another good option to add to it if possible.
    Quote Originally Posted by StarMist View Post
    A spine card is the hymen of a new game assuring its first owner that he is truly her one and only, and of a used game assuring its new owner that whilst she has been played with in the past that play has never been too careless or thorough.

  11. #11
    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by xelement5x View Post
    Cool idea. I've actually got an X68K to Genesis adapter I've been needing to build as well and this would be another good option to add to it if possible.
    Great idea! Yeah, this board would be perfect for a Genesis controller on a 68K (with your board to convert the serial data).

    I also forgot to mention this converter works great for adding Sega Genesis controller functionality to arcade games with the JAMMA standard.

    -Segasonicfan
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
    I offer free repair advice through public forums as a service to the community and as a repository of information.
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  12. #12
    Video Game Modder Outrunner segasonicfan's Avatar
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    OK, I've managed to squeeze the Atari 7800 settings into the design now. Just note that these are solder jumpers which set the board to the system you want to use, so I wouldn't recommend buying one for your Atari 7800 and Amiga since they are different settings. However, you could buy 2 boards that I could set to the respective consoles.

    Also note it will take ~4 weeks to fabricate the new design and test on a real 7800 console. The design is finished though

    and here is a pic of the board powered up in a C64:

    IMG_4598 web.jpg

    -Segasonicfan
    Last edited by segasonicfan; 09-06-2017 at 04:01 PM.
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
    I offer free repair advice through public forums as a service to the community and as a repository of information.
    If you cannot post here, I recommend these places that don't have posting restrictions:
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    WCPO Agent CrossBow's Avatar
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    Quote Originally Posted by segasonicfan View Post
    OK, I've managed to squeeze the Atari 7800 settings into the design now. Just note that these are solder jumpers which set the board to the system you want to use, so I wouldn't recommend buying one for your Atari 7800 and Amiga since they are different settings. However, you could buy 2 boards that I could set to the respective consoles.

    Also note it will take ~4 weeks to fabricate the new design and test on a real 7800 console. The design is finished though

    and here is a pic of the board powered up in a C64:

    IMG_4598 web.jpg

    -Segasonicfan
    Very cool! I was just mainly curious from an academic standpoint though. There is already the EdLaddin seagull78 adapters for like $25 each + Shipping from AtariAge that allow Genesis controllers to be used on Atari systems and the 7800 as well. But yours adds even more systems with the commodore in there so hence...my curiosity on it. Also your adapter I think would be too large to actually plug into the 7800 ports as is with the lip of the top shell overlapping the controller ports the way it does. So would need a small 3 - 6inch cable in front of it.

    https://atariage.com/store/index.php..._detail&p=1079
    Last edited by CrossBow; 09-06-2017 at 05:38 PM. Reason: added link

  14. #14
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    Quote Originally Posted by segasonicfan View Post
    ah, thanks. The resistor and pinout difference is OK but needing to use a different common pin instead of ground really switches things up a lot. It would be some work to hack this board to do it, though it is possible. A better solution would be for me to design a version solely for use with the 7800. I can do this if there is interest, say 10 people or so interested in a pre-order.


    Thanks!

    -Segasonicfan
    Would it be possible do build a PS2 to Genesis adapter? So we could use a PS2-Mouse and a PS2-Keyboard on the Genesis? That would be great!

  15. #15
    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by CrossBow View Post
    Very cool! I was just mainly curious from an academic standpoint though. There is already the EdLaddin seagull78 adapters for like $25 each + Shipping from AtariAge that allow Genesis controllers to be used on Atari systems and the 7800 as well. But yours adds even more systems with the commodore in there so hence...my curiosity on it. Also your adapter I think would be too large to actually plug into the 7800 ports as is with the lip of the top shell overlapping the controller ports the way it does. So would need a small 3 - 6inch cable in front of it.

    https://atariage.com/store/index.php..._detail&p=1079
    ah, now you tell me...lol. Well, it never hurts to add more compatibility. The advantage of the Uni-Gen is that it has adjustable autofire and A can be set to jump (this is a huge deal to me for those older games). Another advantage is that I will be adding support for more controllers via breakout boards to the Uni-Gen (for example, I'm making a Uni-Gen to PCEngine adapter right now).
    For $49.00 shipped it's not a bad alternative. Though yes, someone would need a extensions cable for any Atari / SMS / Genesis because of the plastic lip around the board. I wish I knew where to source plugs to fit into that...

    Would it be possible do build a PS2 to Genesis adapter? So we could use a PS2-Mouse and a PS2-Keyboard on the Genesis? That would be great!
    it's very possible but I won't be doing it because this requires a lot more circuitry. The Uni-Gen converter changes your Genesis pad into a purely analog joystick, that's the great thing about it. PS/2 stuff is serial data with a clock signal and such - that requires converting the analog back to serial. There's lots of serial converters floating around for sale that allow you to use all sorts of controllers via USB and stuff. However, there's nothing quite like the Uni-Gen out there that lets you add a Genny pad to so many systems with as much DIY functionality without using a micro-controller.


    -Segasonicfan
    Last edited by segasonicfan; 09-07-2017 at 05:45 PM.
    My Website:
    SEGASONICFAN DESIGNS

    Sorry, I don't respond to PM's for repair advice. Please consider posting on the forums - your question might be somebody else's answer!
    I offer free repair advice through public forums as a service to the community and as a repository of information.
    If you cannot post here, I recommend these places that don't have posting restrictions:
    https://nfggames.com/forum2/index.php
    https://www.smspower.org/forums/
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