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Thread: Powering an AT MB with an ATX PSU

  1. #1
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    Powering an AT MB with an ATX PSU

    Hello List,

    First post...

    I live in South Africa and so getting hold of the right components isn't just a case of logging onto the net and ordering (some stores charge USD150 to deliver to here )

    I think I've exhausted most posts (and typing AT into Google doesn't help much), so here's the question:

    Is it possible to power an AT MB with a ATX PSU (obviously the connectors are different, but a side cutter and some guts is a wonderful combination)? I'm thinking ordering a M2-ATX to power my P(whatever) 300Mhz lying in the garage and are worried about incompatibility.

    Before someone asks why I'm trying to run a P(?) 300MHz - I want to control the hydraulics on my vehicle and don't need serious computing power (and the PC is lying around anyway).

    eBay doesn't exist here...

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Not going to work.
    You need an AT PSU.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
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    Thanks DarquePervert - I've read numerous of your posts and respect your opinion.

    However, why? Is it the voltages? I would have thought that an ATX MB would have more features (that can be overridden) than an AT MB? I hope I have enough skill to turn the M2-ATX on (shorting the "power on" signal).

    Or is there some other sinister reason it cannot be done?

    BTW:
    1. Try to find an answer by - Tried
    2. Try to find an answer by searching the Web - Tried
    3. Try to find an answer by reading the manual - Could only find ATX12V specs
    4. Try to find an answer by reading a FAQ
    5. Try to find an answer by inspection or experimentation - AT PSU's are a bit hard to come by in RSA and don't want to fry my MB
    6. Try to find an answer by asking a skilled friend - They ask me
    7. If you're a programmer, try to find an answer by reading the source code - HW

    (The above is not meant to annoy - I hope)

  4. #4
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    At-atx

    I wouldn't give up on that! Powering the AT MOBO it isn't the problem. Switching it on would be. Here are a Few links you might find help full:

    AT PSU pinouts

    ATX PSU pinouts

    How to power a ATX PSU without a MOBO

    All About Standby power

    I converted my m2-atx to run my Compaq 12pin PSU. With no ill effects yet.

    hope this helps. Good Luck!

  5. #5
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    Thanks a stack offrotor - most especially for saying that it's possible.

    I have read almost everything I can so thanks for the additional links.

    It would therefore only need to hold the RemotePower tied to GND and all would be fine?

    I've also read that most ATX power supplies share the 5VDC and 3.3VDC converters (the 3.3VDC being linear regulated from the 5v rail) and so any load on either the 5V OR 3.3V will prevent failure - ie: I don't need to load the 3.3V rail, as long as the 5V is loaded?

    I don't need to worry about putting a load on 5VSB (can supply 720mA, but that would probably be a linear device?)?

    Clearly the M2-ATX is designed for the so-called deep sleep mode (when the above is irrelevant), but I'm very worried about the fully-awake mode and seeing smoke escaping from parts.

    Thanks for all assistance.

    BTW (might be useful to someone): http://www.wikihow.com/Convert-a-Com...b-Power-Supply

  6. #6
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by offrotor View Post
    I converted my m2-atx to run my Compaq 12pin PSU. With no ill effects yet.
    That's a whole different animal from an AT power supply.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  7. #7
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    That's a whole different animal from an AT power supply.
    True!


    I was just pointing out that, most things people say CANT be done, can in fact be done! All You just need is a little know-how and or support from people who do!

    Peace!

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