Abstract: The adaptation of a regular pocket size computer for use by a visually impaired person is provided. A framework is firstly provided for building adapted applications, having adapted input and output services, a system resources library including tools for interacting with these adapted services and an adaptation library. A tactile keyboard is further provided to allow data entry through the screen interface of the computer. The tactile keyboard includes a membrane having raised keys on one side and corresponding screen activating tips on the other. Means for mounting the keyboard above the computer with the screen activating tips positioned in contact less alignment with the corresponding selected areas of the screen interface are also provided.