8 Apr
2007
8 Apr
'07
4:42 a.m.
On 7 Apr 2007 at 17:11, Jules Richardson wrote:
.. anyone know how the heck that works? I don't
get how you can even boot a
system with two video boards that are going to both expect to have ROM code
and ports at the same addresses. Even if you could somehow disable the BIOS on
one of them, there's still a bunch of conflicting port addresses to worry about.
Note that this is for "two *PCI* VGA cards". PCI differs from ISA in
that addresses for ISA cards are pretty much fixed or changed by
switches; PCI addresses are assigned by the BIOS; each PCI device has
its own configuration registers.
You can mix two ISA display adapters, but only so that there are no
I/O port or address conflicts. So, two VGAs would be prohibited,
but a VGA and an MDA should be a permitted combination, for example.
Cheers,
Chuck