MCS9865 PCI Serial Expansion Card — 4x RS-232 9‑Pin COM Ports (Integrated)

Add four RS-232 serial interfaces to a PCI desktop with this MCS9865-based expansion card. Provides 4 integrated 9-pin COM (RS232) ports for connecting modems, POS devices, industrial equipment and other legacy peripherals. Simple PCI plug-in design expands serial connectivity without altering existing system specs.