Sega Mega Tech Adapter

Discussion in 'Modding and Hacking - Consoles and Electronics' started by raygallyer, May 5, 2013.

  1. raygallyer

    raygallyer Member

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    Hi guys,

    I bought a working megatech cab a few years ago, in my time i have rebuilt both monitors and replaced the psu when they have died, fantastic buzz when you fix your own machines. I also have managed to collect 42 of the games made for this system, always looking for more.

    Anyway to the point, I see on other old posts that it is possible to modify a mega tech cartridge into a converter/ adapter. I have found pinout info for megadrive and megatech cart, also some info on the megatech ic.

    Now i'm lost......... i have all this info but don't know how to put it all together and make a converter, I have a donar megatech cart and some edge connectors coming soon. I think my first step would be to desolder and remove the 40pin ic 1 off the mega tech cart.

    Can anybody help me?
     
  2. raygallyer

    raygallyer Member

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    Good news, I managed to make a working adapter.

    Using the info above and an image of a home made adapter I found on the web I put one together, when I get some free time I will document how to make it.

    I have tried 5 megadrive carts and 3 of them worked, FIFA soccer, roadrash and street racer all work well.

    I can't get alladin or midnight resistance to work, I think midnight resistance is possibly broken and with alladin I get a message on the main monitor saying something like only certain games will work on this system.
     
  3. Shane McRetro

    Shane McRetro Blast Processed Since 199X

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    I wish I could help with this sort of thing, but it is way over my pay grade!
    I'm surprised that no one else piped up though!
     
  4. stevebm2

    stevebm2 Newly Registered

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    I tried doing this,but im having no luck,Ive used a world championship soccer cart,ic2 is still present,but ive desoldered ic1 ,here is what pins I connected,have I done something wrong?


    side A of the megatech cart is the same as side A of the megadrive,so I connected all of the pins to each other,side B I did this with the megadrive cart slot pins:

    PIN 1 N/C
    PIN 2 N/C
    PIN 3 N/C
    PIN 4 to PIN 40 IC1
    PIN 5 to PIN 39 IC1
    PIN 6 to PIN 1 IC1
    PIN 7 to PIN 7 MT
    PIN 8 to PIN 8 MT
    PIN 9 to PIN 9 MT
    PIN 10 to PIN 10 MT
    PIN 11 to PIN 11 MT
    PIN 12 N/C
    PIN 13 N/C
    PIN 14 N/C
    PIN 15 N/C
    PIN 16 to PIN 12 IC1
    PIN 17 to PIN 10 IC1
    PIN 18 N/C
    PIN 19 N/C
    PIN 20 N/C
    PIN 21 N/C
    PIN 22 to PIN 29 IC1
    PIN 23 to PIN 27 IC1
    PIN 24 to PIN 25 IC1
    PIN 25 to PIN 23 IC1
    PIN 26 N/C
    PIN 27 to PIN 17 MT
    PIN 28 to PIN 28 MT
    PIN 29 to PIN 29 MT
    PIN 30 to PIN 30 MT
    PIN 31 to PIN 31 MT
    PIN 32 to PIN 32 MT


    Any idea what ive done wrong?,all my soldering is fine,ive checked .

    thanks in advance
     
  5. retro

    retro Resigned from mod duty 15 March 2018

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    I didn't see this before, or I would have offered! Would be handy if the OP had stated location, mind you! ;)
     
  6. raygallyer

    raygallyer Member

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    Try pin 17 to pin 27 MT

    Unfortunatly I dropped mine and broke it, i need to check all my wiring again.
     
  7. drakon

    drakon Gutsy Member

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    I could do this but without a megatach pcb I couldn't test anything.
     
  8. Bad_Ad84

    Bad_Ad84 The Tick

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    Or the correct pinout, which is what is being discussed/clarified.
     
  9. stevebm2

    stevebm2 Newly Registered

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    pin 27 MT is the same as IC10 (CE) so will make no difference
     
  10. raygallyer

    raygallyer Member

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    I couldn't get my adapter to work, I can only guess that I got a short and damaged the other IC.

    I made another using the same pinouts as above and it is working fine, (including pin 17 - pin 27) this time I will be more carefull with it until it's safely inside a case.
     
  11. mar.vetto

    mar.vetto Rising Member

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    I made many adapter during last 2 years and I tested many megadrive games with these adapters.
    These are the games are not working on my megatech system using the adaptor:

    Streef fighter 2 (any version any region)
    Super Street fighter (any version any region)
    NBA Jam 1.00 any region (this is very strange the games starts just fine bus end in a black screen after the Iguana with ball image)
    NBA Jam 1.01 any region (this is very strange the games starts just fine bus end in a black screen after the Iguana with ball image)

    There are other games I tested which were not working with the adapter but I managed to set multy-region using a maga drive
    donor cart and burning the modified game image on eproms, just need to modify the region line to 4A 55 45.
    This works for many games.

    If anyone need some help with adapter building I can offer my help
    If anyone get NBA JAM or Streetfighter working on megatech with adapter please contact me!!!!

    thanks
     
  12. Sonny_Jim

    Sonny_Jim Enthusiastic Member

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    Could you list the pinout? I know a couple of guys on Jamma+ who would be very grateful for the information.
     
  13. Druidic teacher

    Druidic teacher Officer at Arms

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    x
     
    Last edited: Jun 22, 2017
  14. sonicdude10

    sonicdude10 Insane redneck retro gamer...

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    Region lockout most likely for lots of the games. The MegaTech is basically a Sega Genesis on crack & steroids. So if you leave the IC2 chip alone and ignore the other 7 slots on the PCB you basically have a Sega Genesis. I had some trouble with a few games on my Genesis consoles and found it was region. My main issue was the game loaded the TMSS then went black screen. Moving to my all region model 3 and setting the region to JAP fixed the issues with all nonfunctioning games. If you haven't already tried it, mess around with the different region settings on the board. There's 4 combinations but only 3 were commonly used. Last one is kinda known as ASIAN. It's just the console set to JAP on language and PAL on video. Shouldn't need that. Can't tell you how to change the region settings for the MegaTech since I don't have one but it sounds like you already know. Try regions modes in this order and see what works: NTSC (english language, NTSC video) PAL (english language, PAL video) JAP (JAP language, NTSC video) If that still doesn't work then try ASIAN. If it still won't work after that and you know the adapter works then the issue might be in the header area of some games.
     
  15. erhanpurple

    erhanpurple Active Member

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    can anybody share their knowledge about building the adapter? what is the correct pinout?
     

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