Computer able to determine whether or not a display is connected to it, in accordance with the status data stored in a register, and method of detecting whether or not a display is connected to a computer

摘要

A computer comprising a main body, a connector (38A) having pins for connecting an external display (38) to the main body, a register (R10) for storing data (D4) representing a first status or a second status in accordance with the voltage of specified ones (P1, P2, P3) of the pins of said connector (38A), and a display controller (24) for controlling the external display (38). The computer further comprises a data-reading section (11) for repeatedly reading the data (D4) stored in the register (R10) and counting the number of times the data (D4) representing the first status is read from said register (R10), and detecting section (11) for determining that the external display (38) is connected to the connector (38A) when the number of times the data (D4) representing the first status is read from the register (R10) reaches a predetermined value.