Abstract: A visiting card-sized computer includes a wallet-like carrying case, a computer body, and a keyboard. The computer body and keyboard are on different foldable sections of the case, connection of the keyboard to the computer is by a ribbon cable extending between the foldable sections, and an input/output port for a second cable connecting the visiting card computer with another computer is situated on the keyboard. The second cable may include an RS-232 connector, a converter, and a DB25 connector. In addition, connection between the ribbon cable and the computer body is via a PCMCIA interface connector, permitting the computer body to be plugged directly into a notebook computer upon removal from the carrying case.