Reboot a 70\s retro design classic! RetroFX is a remake of the Casio fx-39 scientific calculator, complete with moving switches, keys, sound and an authentic, \green\ vacuum tube display, beautifully rendered in amazing 3D. * Rotate 360, turn, scale and move in 3D with your fingers. * Green screen, 7 segment display with adjustable glow. * Buttons physically press with sound. * Move the mode switch with your finger. * Even the on/off button works! * High resolution modelling. * Tilt affects light reflections. * Looks awesome on a pad. RetroFX is based on the Casio fx-39 from 1978 made in Japan. Casio made many models with this very popular case design, but functionally, they were all slightly different. The RetroFX display is a reconstruction of the popular green Vacuum Fluorescent Display (VFD) which is actually a small cathode ray tube. RetroFX recreates the original glow given off by these tubes which would typically vary depending on battery strength.