System Structure: intelligent buffer card.

                              expandable cable with four standard DB25 connector.

Serial communication Controller :

                              TYPE : 16550A compatible with PGA support.

                             SPEED : 1.8432MHZ can upgrade to  7.3728MHZ

Hardware compatibility : ISA bus slot.

                                    80286/386/486/Pentium above system
Software compatibility : SCO XENIX/SCO UNIX

                                       MS-DOS

                                       WINDOWS 3.1/NT/95/98

                                       Other operating system

System I/O address mapping : Jump selectable to choose COM1 or COM2 mode

                                              I/O map in COM1 : 290h-2D7h.

                                                COM2 : 190h-1D7h.

System interrupt mapping : Jump selectable IRQ3/4/5/7/10/11/12/15.

                                               In SCO UNIX/XENIX must be set to IRQ4 in COM1 mode 

                                               and IRQ3 in COM2 mode.

                                               In other system no limitation in setting.

Port capability : Number of port:4 ports per card.

Interface : RS232C compatible.

Baud Rate : Each port can be configured to 50-38400bps in  UNIX system

PCB Dimension : 5.0*3.15 inch

Operating Temperature：0 to 55℃