Comment by bcrl

Small (10cm x 10cm) 2 layer PCBs only cost about $2 these days ($6 for 4 layers), which makes more complex designs possible for hobbyists. However, I am impressed at the hand soldered build by the author! Prototyping on breadboards is so much more accessible with CPUs that are only clocked at a few / tens of MHz and don't have thousands of pins... Looks like hours of fun!