I was an electronic tech in the air force back then and a buddy and I disassembled a couple of Sony laser disc players for the lasers. We got a pair of servos

I was an electronic tech in the air force back then and a buddy and I disassembled a couple of Sony laser disc players for the lasers. We got a pair of servos and created a 2 way mirror deflection device. We used the STEREO output of an Amiga 500's audio to control the servos' deflection, one channel for each servo/direction. With a little programming, we were able to "paint" a picture on the wall with the laser.