The half size card provides two serial ports independently configurable as RS422 with and without handshaking or RS485 full and half duplex. Each serial port may be jumper configured as COM1- COM8 with an interrupt jumper 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!