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Hi Oleksij,
thanks for the hint. I installed and ran ASUS Live Update. It installed 2 components: ASUS Live Update v 3.1.9 and Fresco USB3.0 Driver v 3.5.4.0. I also did Windows 7 update (110 different updates, mostly security related). After updates I repeated the tests I mentioned above.
Running Jpcsp on battery with maximum processor state set to 100% (with 87% charge) didn't cause crash. I repeated the test (84% charge) and didn't get crash. I put AC cable back on and forced max processor state to stay at 100%. I pulled AC cable off and didn't get crash.
But there are two things. I ran Jpcsp simultaneously with system monitor and now CPU usage was all the time under 50%. Maybe the updates did something to reduce CPU usage? I need to do more tests and for that I need heavier application than Jpcsp, to test if heavier CPU usage still causes crash. I also need to repeat the original test with lower battery charge, since it seems that there might be a trend towards less stable Windows 7 when battery charge is lower.