Control real world devices with your PC

Step 4 Protoboard layout of the download circuit

This photo shows the download cable which is simply a D9 plug and a couple of metres of some multi core cable. Most modern PCs have a D9 serial port connection. A PC built before about 1998 might have a 25 pin connector. I soldered about 1cm of solid core wire onto the end of the flexible wires and then put heatshrink around this - the solid core wires go into a protoboard much better than flexible wires.