I don't think I've used a TI calculator (they're not in NZ much), but with the sole exception of my HP 48G every make and model of calculator I've used in the p

I don't think I've used a TI calculator (they're not in NZ much), but with the sole exception of my HP 48G every make and model of calculator I've used in the past 30+ years has used a crappy membrane keypad.