The half size card provides one RS232 serial port, using a standard 9 pin Male D connector. The single port may be jumper configured as COM1 – COM8 with interrupt line jumpers set to IRQ 2-7, 10-12, 14-15. Serial Solutions Device Driver CD contains software for Windows Millennium, Windows 98, Windows 95, Windows NT4, Windows 3.x, DOS and OS/2. Informative manuals and sample programs are supplied with full source code on CD! 16550 UARTs provide a 16 byte input and 16 byte output FIFO hardware buffer for each serial port allowing high data rates without data loss or overrun errors in todays multi-tasking operating systems.