| Rapid firing example, frequency = 50/2 = 25Hz

| Rapid-fire the return key when fire_1 is pressed.
| Uses a 1 bit counter giving a frequency of 25Hz,
| see the counter in operation using !JS_Test

|---------------------------------------------------

| Count from 0 to 1 using flagA_1
setA_1   = ~flagA_1
resetA_1 =  flagA_1

| Press return when fire pressed and count is 0
return   = fire_1.~flagA_1
