Immediately after switching the page, it will work with CSR.
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Or it could be platform quirks, or more interesting failures like crystal oscillator degrading, but I'd leave those to later.
Not to say SRAM is any better (it means "I shit").
I likewise wrote a COVID-boredom-induced blog post about my many missteps, and eventual failure, getting AIX to run on an old PC. My "learnings" there were that the installation media (floppies) are _written to_ by the installer, making a reset to a known state rather difficult, and also that support for IDE disks was only made available in a patch.