Which Apple II do you have? It's easy to defeat the color killer on a II or II+, and I bet it can be done on a //e or //c as well. Bear in mind, text will have purple & green tinges, and 80 col will be illegible. I'll dig out the Apple II schematic and tell you which pin(s) of which chip need to be lifted. Since the //e and //c may not have socketed chips, they are a bit harder to modify.