Dark Cloud 2 (NTSC-U) - Item Menu Overflow Capabilities Part 1 - Dungeons
The item menu overflow glitch can do a lot more than just unlocking Zelmite Mine early. The memory that gets corrupted depends on if you're in a dungeon or not.
For part 1, we'll check out the dungeon version of this glitch, which is far less damaging than the normal map version. On console, the only outcomes you'll get are graphical glitches. On PCSX2, you can get better graphical glitches, a few strings of text that I have never seen in normal gameplay, and memory writing to wrong locations, but the only outcomes of this worth showing at the moment are messed up gravity and dungeon floors loading with missing terrain. There's one outcome that randomly corrupts memory that is usually read only, but I don't think there's a way to predict what memory addresses get corrupted.