Previously with 787cl+ motherboard it helped to short-circuit the 14th and the 15th pins of the ATX connector so the PSU stayed on. With M789CLU such a trick does not work. The PSU stays on, but the MB doesn't boot.
Does anybody know how can I make the board to be always on? Is there any port register that I should write to? Or is it a CMOS bit?
Not sure if there's a software solution, but the hardware solution I'd recommend would be a 555 timer or some such. Connect the output to a transistor that would short the power switch lines, and have it pulse every 30sec or so. (29sec off, 1sec on, or thereabouts) That would give the board enough time to get into protected mode (and hence refuse to power down at a single toggle of the switch), while still having a vaguely responsive system after poweron. You would have to disable acpid in Linux to keep it from powering itself down again, but that is not a big deal.
My schematic would look something like this:
^ +5V | +v^v+v^v+-----------+---|(---Ground | | | | +--O---O---O---O--+ | | + DSC THR BYP | | ) 555 | | | GND TRG OUT RST | | +--O---O---O---O--+ | | | | | GND +---)-----------+ | > < > SW+ ----\ | |-+ (NPN) SW- ----/
joshua
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