Edit, Save, and Use Hex Files

[Edit, Save, and Use Hex Files]

WOW, thanks mate!

[Edit, Save, and Use Hex Files]

Thanks again, mate. Sounds like I need to scour the Internet and find an already-hacked version. I actually finished this game on my 800XL many years ago, no way I could do it now without cheating! 

[Edit, Save, and Use Hex Files]

Thanks, mate. I have the image already just not sure how to save the changes for use on the device where loading trainer files does not seem doable. I can edit the file with a hex editor but do not know how to save it as a usable, hacked image.

[Edit, Save, and Use Hex Files]

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!