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Thread: Which power supply for this 286 clone MB?

  1. #1

    Default Which power supply for this 286 clone MB?

    So I got a hold of this no-name 286 MB. Seems to be similar to this one http://www.uncreativelabs.de/th99/m/U-Z/33636.htm

    I want to test it out, but then I realized there were no keyed slots in the motherboard power pin sockets like I am used to seeing with AT systems. The board says PS2 near the power connector. Any idea which PS I should try to source or build to connect to this thing? If there is a recommended pinout, maybe I can hack one together out of an ATX PS if I could find the right plugs w/pins.
    MVIMG_20200918_235746_sm.jpg
    MVIMG_20200918_235828_sm.jpg

  2. #2

    Default

    That's a standard AT power connector. If it's not keyed, connect it so that the black ground wires of P8 and P9 meet in the middle of the connector.

  3. #3
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
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    Default

    A big one with a Red on/off switch at the side.
    For At better to use a 150W version, to be recognised through 3 or 4 Disk Drive power connectors.
    The 130W , with 2 Disk Drive power connectors can be used but beware not to full fill all option in your PC.

    Could be that there are also old small boxed PSU's with those 2 white Mother Board connectors.

    Example
    20200919_XT-AT PSU SCHRACK 130W.jpg

  4. #4

    Default

    Thanks. I ordered one like this just to test it out. I could use a spare anyway. https://smile.amazon.com/ATHENA-SUPP.../dp/B017O243SQ
    I might see if I can still order some of the AT connectors and pins so I can reuse some of my existing power supplies in the future as the AT PSs seem to be getting more and more rare these days.

  5. #5
    Join Date
    Apr 2014
    Location
    Dordrecht , Netherlands
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    Beware of the "Power ON".
    That is a signal from MBoard.

    You have to manually make that signal.
    On internet lots of idea's how to. - Its easy Just wire Power-ON to GND Ground to start the PSU.
    Green Wire to A Black

    An old AT just has only a Power-OK signal. That is to start up the CPU.
    Power-OK is a signal from PSU that al voltages are OK to run the PC safely.

    New ATX PSU it is the Gray Wire "Power OK" -check "ATX Pin OUT" google search.
    So must be on your AT connector.
    Pin-Outs are lost of to find..

    Check Firmly ! the colour code to voltage on both the connectors.
    1 mistake will definitely ruin your board.

  6. #6

    Default

    Quote Originally Posted by MauriceH View Post
    Beware of the "Power ON".
    That is a signal from MBoard.
    Thanks! I probably would have put 3.3V on there otherwise. I took the time to trace the power connections from the ISA bus just to make sure my pinout was right. Then I hacked up my old ATX PS and tested it out. I am getting the right voltages, but it doesn't boot up. I will play around with it some more at another time, but at least I got the PS to work. Also, I found these on ebay. https://www.ebay.com/i/233552448781 Would have saved me some time if I was willing to wait for shipping.

    This picture from google search would have led me down the wrong path of putting 3.3V on the "Power OK" line.
    atpic.jpg

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