MAKE Flickr photo pool member rRbohn uses a bunch of light switches to program LEDs –
“Bank of 8 switches for the Way Old-School Programmer… This is the output section for my Way Old-School Programmer computer. One of my red LED’s was bad, so I took it off the board and will have to buy two to complete that part. This will initially hook up to the Arduino board, eventually I plan to at a Mega8 AVR right on this board. “ – Photos & more.