Display system

A display system is described, comprising a display device (88) for generating a visual output in response to a plurality of data signals defining the data to be displayed, a display adapter circuit (92) for generating the data signals in a form specified by control data identifying the display device (88), an output port (94) for connecting the data signals from the display adapter circuit to the display device (88) and for connecting the control data from the display device (88) to the display adapter circuit (92), characterized in that the display system further comprises a non-volatile memory (9) located in the display device (88) for storing the control data in the form of a plurality of control codes, and communication logic (95) for communicating a control code between the memory and the output port (94) in response to a command signal (21) generated by the display adapter circuit (92). The communication logic comprises a serial data link (3) for communicating the control code between the display device and the output port, device logic (97) located in the display device for communicating the control code between the memory and the serial data link, and adapter logic (96) located in the display adapter circuit for communicating the control code between the serial data link and the display adapter circuit.