Using quad or dual cards

[oregon <or...@po...>]

Has anyone had any success getting multiple separate instances of X to
run on separate screens of a quad or even dual-head graphics card?  I
have a Matrox G200 MMS Quad, which gives you 4 separate bus IDs for
the 4 different monitors, but I can't seem to get prefbusid to address
any monitor except for the primary (first) one.

I'm trying to get as many as 6 or 8 touchscreens running from one PC,
so I would really like to be able to use dual or quad head cards so I
don't run out of PCI slots. Has anyone had success with any dual or
quad head cards? If so, send me your recommendations, and maybe a copy
of your config files too if you're feeling generous.

dave.