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Thread: Old Xenarc (MP-SC3?) interfacing with new Xenarc PSU-PC12

  1. #1
    Join Date
    Apr 2010

    Old Xenarc (MP-SC3?) interfacing with new Xenarc PSU-PC12

    I have a used MP-SC3 (older model, from 2005 - celeron 2ghz running at 1.6ghz), and a new PSU-PC12.

    The install pics will be posted afterward, but there is some information needed before I can continue.

    The motherboard/case combo I have in my possession does not include an ACPI jack to plug the PSU into. I am planning on adding one so it can be plugged in (versus cutting the cable and wiring it directly).

    Attached is a picture of what the motherboard looks like without the DVD/HDD attached. I must admit that it's the most non-descriptive motherboard I've seen in a long time. I'm not sure exactly which model it is, and have been having issues getting schematics/definitions for the pin outs.

    CPUZ reports the following:

    Mainboard Model - Springdale-G (0x0000047D - 0xBCF432E0)
    Hardware Monitor - Winbond W83627HF
    Northbridge - Intel i865P/PE/G/i848P rev. A2
    Southbridge - Intel 82801EB (ICH5) rev. 02

    I've also attached the CPUZ report, in case it would help.

    In the picture, I've circled where I believe I should connect the headphone jack. My intent is to upgrade my current system to include an ACPI jack (which it currently doesn't but has the correct hole on the back panel for). What I'm not sure about is whether or not I should be wiring it to the (circled) green or blue side, and knowing definitively which pins are which would be a good thing as well. Currently I have to assume the larger one is GND.

    If I'm about to do it wrong here or there's an easier method (ie: those jumpers I see near the back, not certain what they provide) please let me know. If you've done something similar, please chime in!
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  2. #2
    Join Date
    Apr 2010

    Thumbs up

    After a little T&E I found which two pins are used for the power switch.

    I've pointed to them in the attached picture. When I short them together the power LED comes on and the PC boots.

    Does this look like a suitable place to put the TRS jack? (It does to me..)

    I'm also curious if I'm correct that the green wire (from PSU) should go on the PSU side of the switch, and the black wire (that goes with green, from PSU) should go on the CPU side of the switch? The two I'm referring to are for the PSU to perform the ACPI function (power on/off).
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  3. #3
    Join Date
    Apr 2010
    One of the old ISA sound cards that was sitting in a junk drawer had a suitable jack, so I pulled it off and connected it to the points I found.

    When shorting the connections through the plastic connector that connects to the PSU using a short bent wire, the computer powers on and will power off using the same procedure.

    It suspends, hibernates, etc - seems to be working like a charm.

    Will post more this weekend once I've installed it.

    Let me know if any of this sounds or is wrong! As far as I can tell, this is how it should be working.

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  4. #4
    Join Date
    Apr 2010
    I've included a couple pics of the dash mod as well as the initial PSU and PC install. The switch in the middle has a green light that glows when it's on. It controls the ACC+ going into the PSU.

    The green and black lines going into the PC is what plugs into the modification I made, the "ACPI control line".

    Also, there is an added layer of 3/4" wood added between the seat and its cover which is what the gear is fastened onto, for those wondering if I screwed right into the seat.

    After testing the PSU for 12v/etc, I tested with the PC and the ACPI modification worked fine. When I flipped the ACC on using my switch on the dash the PC booted up, and when I flipped it off it hibernated and shut down gracefully.

    I'm happy with how this turned out, and hope this might help if somebody else has an old Xenarc and want ACPI support (to use their new power supply).

    I also picked up a suitable reset switch that I'll add sometime in the future. Hopefully the machine is stable enough it won't need it.
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