How many Firewire busses?

Hi there,
i just wonder how many firewire busses (NOT ports) my MacPro actually has... There is very few documentation about this. So maybe are the front ports on their own bus, or share all ports the same bus?
I ask cos i want to know if i have to buy an additional firewire card if i want to plug an audio interface and an additional device...
Thanks a lot, best regards
Flo

Hi Flo,
sadly (?) I have a 2006 Mac Pro and not a 2009
But with my usage being mostly external harddrives I have no problems connecting and using more than one of them at the same time.
No downfall speedwise.
But with a firewire audio device the mileage might vary.
Best to have a look at the manufacturer websites or Communities dealing with firewire audio devices for user experiences.
Stefan

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