Product Detail Built-in jumpers provide allow easy configuration to any free IRQ Data transfer rates of up to 460.8 Kbits/sec. for peak serial device performance Easy to install and use with full step-by-step instruction Full jumper set to ensure compatibility with almost any PC system Supports the RS-232 interface . The "Startech.com ISA2S550 16550 Serial ISA Card 2-port" is best product for you. We recommended Startech.com ISA2S550 16550 Serial ISA Card 2-port