The half size card provides one RS232 serial port and one RS422/485 serial port. The upper RS422/485 port and the lower RS232 port both use the standard ISA 9 pin Male D connector. The RS422/485 port is configurable as RS422 with and without handshaking or RS485 full and half duplex. Each serial port may be jumper configured as COM1 – COM8 with interrupt line jumpers set to IRQ 2-7, 10-12, 14-15. Optional LPT port available with a fly lead from the board to a backplate on the PC. 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!