Linked by Thom Holwerda on Tue 5th Jul 2011 21:46 UTC, submitted by mpxlbs
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Member since:
2007-10-09
They did, way back in 1986 with the introduction of the 386: V86 mode! That's why NTVDM worked at all. Unfortunately, MS didn't keep it up or fix bugs, so it's basically (half) dead these days. And AMD64 just gave them a reason to completely drop it. (And before you ask, no, 64-bit doesn't compensate for the huge speed loss of using a full emulator.)
Yes, it's slow, basically "fast" 486 speed, at best. You need 1+ Ghz just for that! But it works pretty good for sound and graphics (unlike NTVDM).
Actually, check your dosbox-0.74.conf file, you should be able to (sometimes) enable dynamic core for a partial speedup. Or adjust your fixed cycles. Unfortunately, I was told that a 64-bit compile of DOSBox was even slower (ugh).
BTW, DOSEMU under Linux uses V86 and is fast (and LFNs!) but not nearly as good for games as DOSBox. DOSBox is "officially" only for games, not other DOS stuff (e.g. compiling). Unfortunately, DOSEMU x64 has to jump through hoops just to work half as good as 32-bit (and still fails on lots of stuff, sadly).
Your only hope these days is virtualization (VT-X), e.g. paged real mode (AMD's SVM) or unrestricted guest execution (Intel, 32nm Westmere). I've not really tested, but various tools (Xen, VirtualBox) claim to support these now.
EDIT: Obligatory DOS (video) gaming reviews link (often with DOSBox setup tips):
http://www.pixelships.com/adg/