Irrelevant, but yes, I've been using OS/2 long enough to know some of the "standard secrets".
Hyperthreading is off, and ALT F4 immediately results in:
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The system detected an internal processing error at
location ##0158:a278 - 000e:a278.
60004, 6009
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The BIOS is set to "compatible", however there could of course be something I've overlooked.