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Thread: Genesis model 1, 32 X, Sega CD model 1 - Correct power supplies and polarities

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    Default Genesis model 1, 32 X, Sega CD model 1 - Correct power supplies and polarities

    Genesis model 1, 32 X, Sega CD model 1 - Correct power supplies and polarities

    Is this info correct ?

    Genesis model 1 (+)_(. _(-) 9 v / 1.2 a PS Model 8025.1 ?
    Sega CD model 1 (+)_(. _(-) 9 v / 1.2 a PS Mode 4122 ?
    Sega Super 32 X (-)_(. _(+) 10 v / 0.85 a PS Model 2103 ?

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    Outrunner Chibisteven's Avatar
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    Quote Originally Posted by Vector View Post
    Genesis model 1, 32 X, Sega CD model 1 - Correct power supplies and polarities

    Is this info correct ?

    Genesis model 1 (+)_(. _(-) 9 v / 1.2 a PS Model 8025.1 ?
    Sega CD model 1 (+)_(. _(-) 9 v / 1.2 a PS Mode 4122 ?
    Sega Super 32 X (-)_(. _(+) 10 v / 0.85 a PS Model 2103 ?
    I think so. I can confirm the model 1 and 32X polarities are right. I don't know about the SEGA CD Model 1 or 2 because I never had a SEGA CD.

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    Quote Originally Posted by Chibisteven View Post
    I think so. I can confirm the model 1 and 32X polarities are right. I don't know about the SEGA CD Model 1 or 2 because I never had a SEGA CD.
    Thank you. Hopefully someone can confirm the polarity, power supply model number, and v/a for Sega CD model 1. I looked on google but got many different answers or iffy "replacement adapters" so I figured I'd ask here. I recently saw a thread here where someone damaged their 32 x because of polarity so I want to make sure I get all the info exactly correct for each "system".

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    Done with Sega-16 (sorta) Master of Shinobi
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    Both models of the Sega/Mega CD use the same PSU as the model 1 Genesis/MD.

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    Excellent thread. Someone made a thread like this on famicom world and I used it many times for power supply help.

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    Raging in the Streets xelement5x's Avatar
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    Quote Originally Posted by ApolloBoy View Post
    Both models of the Sega/Mega CD use the same PSU as the model 1 Genesis/MD.
    This is truth.


    Also, Vector if you have a hard time with this stuff this page is really nice for you because there are a lot of pictures and it explains it very well.
    http://www.gametrog.com/GAMETROG/How...2_aa-s95j.html
    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.

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    Raging in the Streets Thierry Henry's Avatar
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    Mainly for our UK friends,

    *This is not my information so I can't take credit for it (nor responsibility for any possible inaccuracies), but it's what I found recently stored in a file on my PC.
    IIRC, it must be a good couple years (if not more?) that I stumbled upon this info, and then saved it for future reference.
    Too lazy now to try and dig up the direct link to it*


    UK SEGA CONSOLE POWER REQUIREMENTS (OD = Outer Diameter, ID = Inner Diameter)

    MASTER SYSTEM - MODEL NO. : 3005-05 / DC 9V 850mA / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MASTER SYSTEM 2 - MODEL NO. : 3006-05 / DC 9V 500mA / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MEGA DRIVE - MODEL NO. : 1600-05 / DC 10V 1.2A / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MEGA DRIVE 2 - MODEL NO. : MK-1631-50 / DC 10V 0.85A / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MEGA DRIVE 2 'VA4' - MODEL NO. : MK-1631-50 / DC 10V 0.3A / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MEGA-CD - MODEL NO. : 1690-18 / DC 10V 1.2A / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MEGA-CD 2 - MODEL NO. : MK-4102-50 / DC 10V 1.2A / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MEGA DRIVE 32X - MODEL NO. : MK-84200-50 / DC 10V 0.85A / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MULTI-MEGA - MODEL NO. : MK-4121-50 / DC 9.5V 1.3A / Center Positive / Plug OD 4.75mm, ID 1.7mm
    GAME GEAR - MODEL NO. : 2110-50 / DC 9V 3W / Center Negative / Plug OD 5.5mm, ID 2.1mm


    UK SEGA MAINS ADAPTOR MODEL NUMBERS

    3084 - 9V DC 850mA / Center Negative / Plug OD 5.5mm, ID 2.1mm
    3008-05 - 10V DC 500mA / Center Negative / Plug OD 5.5mm, ID 2.1mm
    1602-05 - 10V DC 1.2A / Center Negative / Plug OD 5.5mm, ID 2.1mm
    MK-1636-05 - 9V DC 850mA / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MK-1636-05 - 10V DC 850mA / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MK-1492-05 - 10V DC 300mA 3W / Center Positive / Plug OD 4.75mm, ID 1.7mm
    MK-4122-05 - 9.5V DC 1.3A / Center Positive / Plug OD 4.75mm, ID 1.7mm


    'MATCHING' CONSOLE AND MAINS ADAPTOR (* = Confirmed, ? = Unconfirmed)

    3084 9V DC 850mA = MASTER SYSTEM?
    3008-05 10V DC 500mA = MASTER SYSTEM 2*
    1602-05 10V DC 1.2A = MEGA DRIVE* / MEGA-CD* / MEGA-CD 2*
    MK-1636-05 9V DC 850mA = MEGA DRIVE 2?
    MK-1636-05 10V DC 850mA = MEGA DRIVE 2* / MEGA DRIVE 32X*
    MK-1492-05 10V DC 300mA = MEGA DRIVE 2 with 'VA4' motherboard (1998)*
    MK-4122-05 9.5V DC 1.3A = MULTI-MEGA*


    PLUG TYPE - Standard Barrel Connector OD 5.5mm, ID 2.1mm (Centre Negative)
    http://en.wikipedia.org/wiki/Coaxial...rchangeability

    MASTER SYSTEM
    MASTER SYSTEM 2
    MEGA DRIVE / GENESIS
    MEGA-CD / SEGA-CD
    MEGA-CD 2 / SEGA-CD 2
    UK/EUR/JPN GAME GEAR

    PLUG TYPE - EIAJ-03 Connector OD 4.75mm, ID 1.7mm (Centre Positive)
    http://en.wikipedia.org/wiki/EIAJ_connector

    MEGA DRIVE 2 / GENESIS 2
    GENESIS 3
    MEGA DRIVE 32X / GENESIS 32X / SUPER 32X
    MULTI-MEGA / SEGA CDX
    NOMAD
    USA GAME GEAR



    EXTRA INFO

    The UK, European and Japanese Game Gear's use the bigger (5.5mm) centre negative plug, but USA Game Gear's use the smaller (4.75mm) centre positive plug

    The US Genesis states it needs DC 9V 1.2A on the label, but the UK Mega Drive states DC 10V 1.2A, its strange that Sega states slightly different voltage requirements for what is basically the exact same console. This discrepancy also applies to other Sega consoles and mains adaptors, for instance the Master System 2 states it needs DC 9V 500mA on the label but the official adaptor outputs DC 10V 500mA. None of this really matters though as all the systems actually run on 5V internally and use a voltage regulator to lower the voltage, so the only downside of the 1V difference is the voltage regulator will run a tiny bit hotter. In other words dont worry if the adaptor or console says 9V or 10V - Sega didnt!

    The Mega Drive 2 with a 'VA4' motherboard is interesting, basically this is similar to a Genesis 3 motherboard in a Mega Drive 2 shell (Both use the same Sega ASIC) You can read more info about Mega Drive motherboard revisions here:-
    http://www.sega-16.com/forum/showthread.php?t=7796
    The 'VA4' was manufactured in 1998 (Yes, Mega Drive 2's were still being manufactured and sold in the UK in 1998!) The VA4 needs less current than older models so Sega included a new MK-1492-05 adaptor which is smaller and has a lower current output (0.3A/300mA) compared to the older MK-1636-05 adaptor (0.85A/850mA) You can use the old or new adaptor on the VA4, but you shouldn't use the new adaptor on an older Mega Drive 2 since they require more current than the adaptor outputs. This also means if you want to use a Genesis 3 in the UK you can use either an MK-1636-05 or MK-1492-05 mains adaptor (Think of this as being a bit like Xbox 360 power supplies, only without a special notched plug that only fits the correct revision)

    Its also worth pointing out that whilst the numerous posts online which say "If it fits, its right" are sort of correct, there's a bit more to it than that. Quite a few of the adaptors may fit a different system but they wont be up to the task as they dont have a high enough mA/A current rating - for instance, using either Master System adaptors on a Mega Drive/Mega-CD/Mega-CD 2 is a bad idea, and so is using a standard Mega Drive 2 adaptor on a Multi-Mega. There is a good chance it may work for a while, but you run the risk of the adaptors overheating/dying/catching fire

    If you are looking for a replacement adaptor the key points to take into consideration are:-
    - The adaptor must output 9-10V DC.
    - The adaptors mA/Amp current rating must be the same or higher than the console needs (Remember that 1A = 1000mA) An adaptor with a higher mA/Amp rating than the console requires is fine, as it will only use what it needs. If the adaptor provides less current than needed it could overheat as the console tries to draw more current than the adaptor can reliably provide.
    - The plug obviously needs to be the correct size.
    - Check if the plug polarity is centre negative or centre positive <This is is very important. The 'big' plug (5.5mm) is always centre negative, and the 'small' plug (4.75mm) is always centre positive
    Quote Originally Posted by soviet View Post
    We believe! SEGA Empire will live again! As the Jews re-established their Israel, GOD will never forget his people, SEGA will never forget her fans!

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    Master of Shinobi omp's Avatar
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    Wow that's a good post! I didn't realise pal got the va4 mega drive 2, certainly in Australia we didn't (or never seen one).
    Thank you for donating to the Sega 16 bit manuals!

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    Thank you very much guys that helped. I just wanted to make sure what I typed in post 1 was accurate because I'm rigging a power supply for a Neptune +. Once it's done, I'll post pictures of unit finished but not sure what section to do it in, maybe Genesis Does. Can't wait to show it to you guys, should be done in 3 weeks.

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