I am unaware of a PCI-based sync serial card. I think
by the time
I forget who produced it (probably Emulex) but the DEC PBXDD-Ax were
(iirc)
a PCI synch card. The DSYT1 was TC, the DNSES was EISA, the PBXDP-Ax
were
ISA. There was another set that were PCI too, but I never did much
development
on the PCI WAN drivers, so it's all a bit murky now.
Antonio