Abstract

A personal computer system is described, having security features enabling control over access to data retained in such a system. The system has a normally closed enclosure, at least one erasable memory element for selective activation to active and inactive states and for receiving and storing a privileged access password when in the active state, an option switch operatively connected with the erasable memory element for setting the erasable memory element to the active and inactive states, a tamper detection switch operatively connected with the erasable memory element for detecting opening of the enclosure, and a system processor operatively connected with the erasable memory element for controlling access to at least certain levels of data stored within the system by distinguishing between entry and non-entry of any stored privileged access password. In addition, switch means are provided for monitoring unauthorized movement of the system together with means for rendering the movement monitoring switch enabled or disabled. When the movement monitoring switch detects movement of the system while the switch is enabled and when the tamper detection switch detects opening of the enclosure, power-up of the system is prevented until the privileged access password (or a power-on password) is successfully entered into the system by a user.