A large aperture, liquid cooled Deformable Mirror (DM) is being developed in support of the ALPHA-LAMP Integration (ALI) experiment requirements. This development will result in a continuous facesheet DM having an active aperture of greater than 28 cm, which is believed to be the largest diameter operational unit developed to date. The mirror is actuated in the active and surrounding guard ring regions by 241 low voltage piezoelectric actuators with a full stroke capability of 10 micrometers for interactuator strokes of up to 2.5 micrometers . The coupling between an individual actuator and the nearest neighbor actuators is projected to be approximately 12%. Performance tests on a smaller scale, simulator unit indicate that all requirements for a high optical power DM subsystem will be met. The design, fabrication, and simulator signal testing phases have been completed and the intermediate results will be reported. The mirror and drive electronics integration and testing are scheduled for completion later in 1993. Performance characteristics of the simulator and portions of the final mirror and drive electronics will be presented, including transfer function, gain and phase data, measured influence function, phase map comparisons with modeling predictions, a 2-dimensional analytical form for the influence function, and surface figure characteristics of the completed mirror.