Were you aware that all the BIOS implementations used in PC compatible computers (Compaq, AMI, Phoenix, etc.) were not identical and were compatible to a greater or lesser extent with the original IBM BIOS, yet Linux somehow supported PC compatible computers?

> Someone saying "it is TSO" is not documentation.

Trying to re-implement what IBM's BIOS did was not documentation either.

The original sets the standard, whether a given implementation is perfectly equivalent or not.

I see no further point for this discussion. Either you truly do not understand or are pretending to not understand the difference between memory models (affect literally every memory access as long as the system is powered up) and BIOS (not used once the OS is up, and thus one-time at-boot quirks handling code can work around most issues). Either way, g'day.

Oh, and to answer your question, yes, quite aware, actually. I've done quite a bit of low level work over the decades, including, curiously, working in the Apple platform kernel team at the time when this TSO bit appeared.