gPort Serial adapters
CubePort

The CubePort universal serial adapter for G4 Cubes supports every serial device that works on your previous Mac. In addition it works with localtalk printers and file sharing and all Mac compatible Midi interfaces. The CubePort like the gPort for G3 and G4 Macs is truly an indispensable adapter for your new Mac.

Since the CubePort connects directly to the G4 Cube's motherboard via the internal modem slot, it allows a greater range of compatibility than other serial solutions such as USB to serial adapters. [Note - You must remove the intenal modem to use the CubePort.] It comes with the CubePort adapter, a quick install manual, torx wrench, and CD with the CubePort drivers.

The CubePort is not only useful and universal, it is remarkably inexpensive. At a suggested retail price of $49. The CubePort is indeed the ultimate G4 Cube compatibility device.

New - the CubePort and 3 way switch Pro Bundle:
The CubePort Pro Bundle includes an manual 3 way serial switch that allows you to switch between up to 3 serial devices without connecting and disconnecting devices. The bundle saves you $10 off the MSRP.