The Quicksilver came in 733, 800DP, and 867, while the QS2002 came in 733 (ED model), 800, 933 and 1.0DP. Hence, your model is an original Quicksilver.
The differences between QS and QS2002 is minimal (excluding comparisons specifications-wise), but boils down to the following:
QS2002 supports LBA48 while QS does not (limited to 128GiB drives for the latter)
QS2002 requires a machine-specific 9.2.2 (pretty tedious to track down) to boot 9 while QS requires just 9.2.0 (easier to get it running, just install from a common 9.2.1 CD and update to 9.2.2)
I am sorry that I don't know the answer to your last question, having never had a need for Mac serial ports myself. Have never seen any PCI serial cards for Macs either. :I
The differences between QS and QS2002 is minimal (excluding comparisons specifications-wise), but boils down to the following:
QS2002 supports LBA48 while QS does not (limited to 128GiB drives for the latter)
QS2002 requires a machine-specific 9.2.2 (pretty tedious to track down) to boot 9 while QS requires just 9.2.0 (easier to get it running, just install from a common 9.2.1 CD and update to 9.2.2)
I am sorry that I don't know the answer to your last question, having never had a need for Mac serial ports myself. Have never seen any PCI serial cards for Macs either. :I