To program the Thingamagoop 2 you’ll need an Arduino UNO board with the chip removed.
Take the front panel of the Thingamagoop off by unscrewing the knobs and nuts on the switches.
Locate the RX TX Rst and GND pads on the lower left side.
Take out the chip from the uno and connect the RX TX and GND lines of the UNO board to those pads on the Thingamagoop’s PCB.
