Serial/Parallel Board (250-4034) Features Faxback Doc # 5484 Adding a second Serial/Parallel board to your computer significantly increases your communications capability by allowing you to add an additional modem to your system. We recommend that you have the second Serial/Parallel board installed by the service technicians at your Radio Shack Service Center. Doing so not only ensures expert installation, but also enables the technicians to quickly check to be sure all the equipment is functioning properly. If, however, you do decided to install the board yourself, follow the steps detailed here exactly. (dkh-08/03/93)