Back to home page

DOS ain't dead

Forum index page

Log in | Register

Search:  
Back to the forum
Board view  Mix view

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.

---
MS-DOS forever!

Post reply
 

Complete thread:

Back to the forum
Board view  Mix view
22049 Postings in 2034 Threads, 396 registered users, 217 users online (0 registered, 217 guests)
DOS ain't dead | Admin contact
RSS Feed
powered by my little forum