Re: Comment on Memory Management FAQ

Eric Auer <[email protected]> Sat, 9 Nov 2002 05:44:49 +0100 (MET)
Newsgroups gmane.os.freedos.devel
Message-ID <[email protected]>
Sure. In Linux and Windows, it is impossible to offer VCPI without
simulating the whole CPU.
So they offer DPMI instead. The reasoning is that most DOS programs that
want VCPI only do so because 1. they are locked in v86 mode and 2. they
want to install their DPMI. Such programs will not need VCPI if they find
that DPMI is already present.

Other programs want VCPI because 1. they are locked in v86 mode and 2. they
want full control over the CPU.
Such programs cannot run in Dosemu or Windows without a program that
simulates the whole CPU (like VMware or Bochs: however, the simulation
is quite slow).

Eric