Masked ROM optical data extraction tool.
Latest version:
https://github.com/ApertureLabsLtd/rompar
Note that this initial version is very much a quick-and-dirty 'see if this method is useful' kind of tool. If it is, hopefully it will evolve into something pretty and elegant!
Hit 'h' when the image has focus to produce some keystroke help in the calling window.
For a walked through example, read this:
http://oamajormal.blogspot.co.uk/2013/01/fun-with-masked-roms.html
Enjoy! Adam