The Norton Disk Edit could only be used as a hex editor in this context.
So you'd guess if something is a cheat code, like maybe some text word standing out in the section clearly belonging to a code. Having experience with assembly you can see if something is a code or a data, even without disassembling it.
You'd get way better chances with Hiew for this, getting hex editor and a disassembler/assembler, nested jumps on jmp's, locations bookmarks.

I see, I though one moment it was a tool which could be abused to scan for key codes. And yes HIEW would be my first choice for a DOS hex editor

I was a subscriber to a gaming magazine. They bundled CDs, later DVDs with at least one full game, some shareware software and games, game demos, patches, trailers, drivers, mods for certain games and various other things including cheat databases.