I learned programming in the eighties and the Commodore 64 was the highlight of getting acquainted with computer science. Retro computing is my way of reliving those early fun days. I maintain a website at http://www.aartbik.com/retro.php where you can find win2c64, a 6510 cross-[dis]assembler on Windows/Linux/MacOS which supports various input and output formats (C64S or T64, H6X, raw bytes, paper tape format) and lots of other retro computing stuff, including a micro-KIM tutorial I have been working on.