Easily configurable isa2s550 isa serial expansion card gives you two additional com ports with data transfer rates up to 4608 kbitssec perfect for connecting serial modems pos devices pdas digital cameras printers isdn terminal adapters and more to your system installation is a breeze with plug and play support and built in drivers for windowsreg 31 95 98 nt4 nt5 plus built in jumpers allow easy configuration to any free irq