System connector

A system connector providing digital communication between two devices comprising:

• first means for supplying a high-level or low-level digital signal to a first device having a first operating voltage in response to a corresponding high-level or low-level digital signal from a second device operating at a second voltage;
• and
• second means for supplying a high-level or low-level digital signal to the second device operating at the second voltage in response to a corresponding high-level or low-level digital signal from the first device operating at the first voltage,
• wherein the first means includes a digital transistor and wherein a high-level input from the second device to the digital transistor opens the transistor connecting an input of the first device to a ground of the second device, and wherein a low-level input from the second device to the digital transistor closes the transistor connecting the input of the first device to the operating voltage of the first device.

A combination mobile phone and accessory comprising:

• first means for supplying a high-level or low-level digital signal to a mobile phone in response to a corresponding high-level or low-level digital signal from the accessory;
• and
• second means for supplying a high-level or low-level digital signal to the accessory in response to a corresponding high-level or low-level digital signal from the mobile phone,
• wherein the first means includes a digital transistor and wherein a high-level input from the second device to the digital transistor opens the transistor connecting an input of the first device to a ground of the second device, and wherein a low-level input from the second device to the digital transistor closes the transistor connecting the input of the first device to the operating voltage of the first device.