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Is there a DOS memory documentation available? (Users)

posted by Japheth Homepage, Germany (South), 19.01.2024, 11:57

I have 2 remarks, which are a bit nitpicking, but to avoid generating myths:

> So with a VME-aware EMM386 version and a Pentium or similar or newer CPU,
> the hardware interrupt IRQ speed loss caused by EMM386 will be much
> smaller, yes.
Actually, VME only may speed-up software interrupts. Hardware interrupts and exceptions will generally switch to protected-mode, no matter what VME is telling.

> Actually, switching to V86 mode from pmode (e.g. EMM386) should be
> faster than switching from pmode to real mode.
This may only be true if there's no context switch involved ( like in Win3x/Win9x ). For DPMI hosts that run as VCPI clients things are different, because register CR3 has to be switched for every mode switch.

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MS-DOS forever!

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