The C600 (and C500) is based on the Alchemy architecture, which is the 6400/5400 architecture. The 6500/5500 is Gazelle.
According to the C600 manual, one can install a modem or an ethernet card in the Comm slot. If one installs a modem, then the modem serial port is disabled.
I'm pretty sure all the ethernet comm slot cards are PCI based, and there's no mention of disabling a PCI slot if an ethernet card is used, so it seems pretty likely that connections for four PCI slots are available.
If would be interesting to do an Open Firmware Device Tree listing for both the 6400 and the C600, except, I don't remember if it IDs a PCI slot if there's nothing installed. Anyone remember?
The number of PCI controllers is one. None of this family of boards had more than one. As far as I know, the PowerSurge (x500/x600 series) was Apple's only extensible machine architecture. In theory, four Bandit PCI bridges could be installed.
According to the C600 manual, one can install a modem or an ethernet card in the Comm slot. If one installs a modem, then the modem serial port is disabled.
I'm pretty sure all the ethernet comm slot cards are PCI based, and there's no mention of disabling a PCI slot if an ethernet card is used, so it seems pretty likely that connections for four PCI slots are available.
If would be interesting to do an Open Firmware Device Tree listing for both the 6400 and the C600, except, I don't remember if it IDs a PCI slot if there's nothing installed. Anyone remember?
The number of PCI controllers is one. None of this family of boards had more than one. As far as I know, the PowerSurge (x500/x600 series) was Apple's only extensible machine architecture. In theory, four Bandit PCI bridges could be installed.