When the iMac and Macintosh computer systems decided to go with the USB interface port over the old serial port, some Mac owners were a little upset. Previous Mac computers had serial ports for printers and other peripherals
The USA-28X from Keyspan fits into one USB port and provides 2 serial interface ports to enable use of your original Mac peripherals
Easily plugs into a USB port on an iMac, iBook, current G4 Macintosh
Draws its power from the USB connection -- a power adapter is not required
Provides two RS-422 mini-DIN8 ports

Se även: http://www.fosh.com.au/article/keyspan-device-drivers

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