I recently came across a "trainer" file online for one of my all-time Atari favourites, Spelunker. The file seems to do its magic of giving 255 lives by writing $FF to address $CB. I'd like to use this on the emulator on my handheld device (PSP) when travelling, but that emulator does not seem to have a way to load these trainer files, so I was wondering about disassembling the image (yes, I own the Atari disk, LOL) and changing the appropriate bytes. Tried this using Omnivore but on launching Altirra it doesn't do the trick. Any guidance? Sorry, but I last had assembly language programming in engineering school many(!) years ago, so I remember just enough to be dangerous!