Abstract: A housing closure apparatus for latching a swingable door which covers an opening in a housing. The housing closure apparatus includes a latching mechanism having a latch guide structure with a channel therein for captivating a slidable latch. A latch receiving member is situated on the housing to receive a portion of the latch therein to latch the door closed. In one embodiment of the invention, the latch mechanism exhibits a dual locking capability such that the latch is lockable in a latch closed position against undesired opening due to shock and vibration, and is further lockable in a latch open position.

Abstract: An apparatus and method are provided for removing an electronic module from a connector within a housing. The module is both insertable and removable through an opening within the housing. The apparatus includes a lever arm which is situated mainly internal to the housing except for an end portion of the arm which extends sufficiently far outside of the housing to enable a user to grasp the arm end portion. The lever arm includes first and second engagement points for contacting the module to assist in the extraction of the module from the housing. First, when the user initially pulls on the arm end portion, this action applies a first relatively high level extraction force to the module at said first engagement point. In this manner, the module is removed from the connector via a relatively high first mechanical advantage exhibited by the arm end portion with respect to the first engagement point.

Abstract: A voltage transient protection circuit is provided for protecting a memory device such as a solid state memory cartridge from an undesired control signal which may occur during voltage transients in the primary supply voltage for such memory device. A transient detector detects transients occurring in the primary supply voltage. An isolation circuit is provided in the control bus, such isolation circuit being activated when a transient in the primary supply voltage is detected. A secondary voltage source supplies voltage to the transient detector and the isolation circuit sufficiently long while the primary voltage is fluctuating during a transient to permit the isolation circuit to isolate the control signal(s)el from said memory device.

Abstract: An apparatus and method are provided for indicating when it is safe and unsafe to insert a memory cartridge into and remove a memory cartridge from a cartridge receiving device. In one embodiment, the cartridge receiving device includes at least one buffer for buffering information signals to be supplied to the memory cartridge althrough such buffer need not necessarily be located within said cartridge receiving device. The apparatus includes an indicator which is caused to assume a first state to indicate to a user that it is unsafe to insert the memory cartridge into or remove the memory cartridge from the receiving device when at least one of the two following conditions occurs: (1) an attempt is being made to write data to or read data from the memory cartridge, (2) at least one buffer is enabled at the same time the memory cartridge is not present in the receiving device.