Add Two RS-232 Serial Ports to Any Desktop — Legacy Hardware Made Easy This dual-port RS-232 PCI card restores classic serial connectivity to modern desktops that no longer include built-in COM ports. Whether you're running industrial equipment, connecting legacy peripherals, or maintaining older systems, this adapter provides two reliable DB9 serial ports through a standard 32-bit PCI slot. 16C550 UART — Industry Standard Reliability: Built on the proven 16C550 UART controller with 16-byte transmit/receive FIFO buffers, this card delivers stable, low-latency serial communication at speeds up to 1Mbps. Compatible with virtually all RS-232 serial devices. Common Applications: Industrial automation and CNC machines Point-of-sale (POS) terminals and receipt printers Barcode scanners and label printers Serial modems and UPS monitoring Legacy lab equipment and instruments Embedded systems development Installation: Plug & play on most systems — the card automatically assigns IRQ and I/O addresses during installation. COM port numbers (COM3, COM4, etc.) can be manually reassigned through Device Manager if needed. System Requirements: Available 32-bit PCI slot (Note: This is PCI, not PCIe) OS: Windows 10 / 8 / 7 / Vista / XP / 2000 / ME / 98SE / NT 4.0 | Linux Driver CD included (most modern Windows versions auto-detect) What's in the box: 1× Dual RS-232 PCI Controller Card 1× Driver CD Specifications: Interface: 2× DB9 male (RS-232) Chipset: 16C550 UART FIFO: 16-byte transmit/receive Transfer rate: Up to 1Mbps Standard: PCI Rev 2.1