1. A tablet computer system, which is coupleable to an external computer having a first interface and a second interface, the tablet computer system comprising: (a) a stylus type device; (b) a sensor section operable to detect positional input by the stylus type device and to output a positional input signal to the first interface of the external computer when the sensor section is coupled to the external computer; (c) a display, laid over the sensor section, operable to receive and display a video signal from the second interface of the external computer when the sensor section is coupled to the external computer; and (d) a combined cable coupleable at one end to the sensor section and coupleable at another end to the external computer, the another end including: (i) a first branch coupleable to the first interface of the external computer, and (ii) a second branch coupleable to the second interface of the external computer.