the weekly whinge

For anyone trying to find out which pins are which on the J21 serial connector on the Geniatech (or mygica) ATV1200 TV box (also sold as a Sumvision Cyclone x2, among others), pin3 is TX, pin2 is GND, pin1 is RX and pin4 is Vcc. 3.3v, 115200 baud.