Vactrex is an emulator for the 1982 vectrex vector-graphics console — the one with a real CRT that drew lines directly with an electron beam instead of pixels. It comes with Star Stomper, an original vector game written for it, so there is something to play the moment you open the app. THE DISPLAY IS THE POINT Most emulators of this machine draw approximations. Vactrex models the analog hardware: the digital-to-analog converter, the sample-and-hold channels, the X and Y integrators, and the…