Keyspan SX Pro X
The 1.2 version of Keyspan SX Pro X for Mac is provided as a free download on our website. This free Mac application was originally produced by Keyspan.
From the developer:
Keyspan SX Pro Drivers should be used with the Keyspan SX Pro serial card. This card is a PCI card that adds additional 4 serial ports to your computer.
You may want to check out more Mac applications, such as RiffMaster Pro, Sequel Pro or PDF Reader Pro Free, which might be related to Keyspan SX Pro X.