Abstract: A portable computer having a frame with a central portion and two end portions. One of the end portions is hingedly mounted to the central portion and a (central processing unit) CPU is associated with the central frame portion. A power module is removably mounted on the frame in communication with the CPU. A keyboard module is removably mounted on one end portion in communication with the CPU, and a screen is removably mounted on the other end portion in communication with the CPU. The frame has fastening mechanism for adjustably securing the frame around a user's arm substantially to prevent longitudinal and rotational movement of the frame, the hinged end portion carrying the keyboard having locking mechanism for maintaining the keyboard at a predetermined angle with respect to the CPU.