Four port USB hub

Step 11 The error message in case it doesn't work

This was the reaction of windows xp to the chipless controller. One data line is pulled up to +3.3 V through a 1.5K resistor and this tells the computer there is a fresh device on the bus.

However, its queries elicit no response so it decides that a faulty device has been plugged in.

Great. Now we know what to expect if we goof up.