I am searching for a circuit diagram for a device that I can build. I need
this device to divide serial data while amplifying the signal so that both
outputs are equal to the input.

I need this because I have a serial device that is providing a one-way data
flow into the serial port on my computer. I want to be able to split this
signal and put it into two ports. Simply running the data in parallel to
both com ports doesn't work because I believe that too much signal is being
lost.

Can anyone offer suggestions?

Thanks.