7-BIT Sum Series User Manual page 4

The last step that you will need to make is connecting a USB cable to the port located on the adapter. The exact description of how to do
this is illustrated below.
WARNING!!!
One should pay special attention to connecting USB cable to your Sum adapter in a correct way. Incorrect installation may result in
serious damage to the adapter, your Amiga computer and/or the connected USB device
Correctly connected Sum adapter is ready to use.
Sum
Pin no. 1 is marked in red.
Pin no. 1
Pin no. 1
4