Martin,
QuaTech 8 port PCI serial port adapter. QuaTech made OS/2 drivers for this card, and it looks like all their serial port cards. QuaTech supplies both an OS2 driver and a virtual driver for DOS/Win-OS/2
It is sometimes marketed by others, such as HP.
There is a special connector on the card which connects to an octopus type cable assembly with the DB9 connectors at the end. This is a half-height card.
I have this running in a PCIe slot using a StarTech PEX1PCI1 PCI express to PCI adapter.
I have two StarTech PCIe to PCI adapters in the same machine: one running the QuaTech PCI serial port card and one running an Intel PCI Network card.