Generating Composite Video

Hello, this is my first post after reading some months, please ignore any mistakes.

I just got this out of my arduino:

and no, i did not write the code myself, i only ported it to my arduino wich was not very hard, got the code from this website:

http://mitglied.lycos.de/polyxos/video.htm

I followed the (german) instructions and burned the resulting hex file into my board with my (eprom)programmer, had to use other fuse settings as the arduino uses a x-tal unlike the schematic on the site.

Now i would like to disassemble his code to make some mods, anyone know how to do this? is there a disasm with the arduino?