If you have no onboard firewire and no PCMCIA slot then the only other way I know of to add firewire is via the newer Cardbus slot. Does your laptop have a Cardbus slot?
OK just had a look at the PB web site and there is no mention of a Cardbus slot on the R1910 so I think you are out of luck

I have seen mention of a firewire to USB2.0 adapter, but I'm not sure if these are any good as USB2.0 is not generally good enough for miniDV capture - but it may be your only option if you can't stream full quality video via USB directly from the camcorder (most can't).
Mark.