Abstract: A tiltable and rotatable base assembly for a monitor includes a substantially rectangular base plate, a rotatable plate having a semi-spherical shaped well for tiltably receiving a semi-spherical shaped bottom wall of an upwardly opening box-like housing, the semi-spherical shaped two portions having approximately the same curved rate. When the monitor is rotated for adjusting the degree of rotation, the box-like housing and the rotatable plate are rotated simultaneously with respect to a support plate on which the rotatable plate and the box-like housing are mounted one above the other. When it is desired to tilt the monitor, the box-like housing is tilted in the semi-spherical well. A detent protrusion is provided for successively detentable engaging with the bottom of the rotatable plate.

Abstract: An option board holding apparatus for accomodating a plurality of option boards, e.g., memory boards or various ROM boards to be plugged in the expansion slots in a computer system to extend the computer's capability. The option board holding apparatus comprises a front chassis of a computer and a holding plate which is fitted into the front chassis. The front chassis has pairs of slots and the holding plate has mating pairs of latching means to be slidably received and retained in the slots. On the face of the holding plate opposite to the latching means is provided a plurality of rails defining channeled grooves for receiving one side edges of the option boards.