> Just a thought, but if a machine contained 2 video cards, what > would be required to pass the resources of the second video card > through to plex86's host OS, and what kind of speed might you > see from this type of operation?
Depends on the cards. If there are two different kinds of video cards with two totally different memory/IO spaces (say VGA and Hercules MGA), it is straight forward. If it is 2 VGA cards, say one on PCI and another on ISA, then each one has to take turns by being switched on and off since they occupy the same memory/IO space. Most (all?) SVGA cards can have their memory remapped to high memory regions. Thus, 2 SVGA cards could occupy two separate memory spaces, however AFAIK their IO spaces cannot be remapped -- thus the necessity to turn each one on and off. If anyone wants to experiment with this, I can look up the correct registers to do this in _Programmer's Guide to the EGA, VGA, and Super VGA Cards_ by Ferraro (3rd edition) which covers ISA and built-in main board VGA, but doesn't cover PCI if I remember correctly. -- techt <[EMAIL PROTECTED]> Proud member of the Electronic Frontier Foundation! Are you? <http://www.eff.org/support/joineff.html>
