The error message "461-mortal-k-4-25-u76.u76 not found" is a specific technical error typically encountered by users of the Multiple Arcade Machine Emulator (MAME) when attempting to run Mortal Kombat 4. It indicates that a required ROM file—specifically a chip image from the game's original arcade printed circuit board (PCB)—is missing from your game folder. Understanding the Error
Check for "Device" ROMs: Sometimes MAME requires a separate "device" or "BIOS" zip (e.g., midwaypic.zip) to be present in the same folder as your game ROMs. File Signature for Verification
Pathing Errors: The system is looking for the file in a directory where it no longer exists or was moved. 461-mortal-k-4-25-u76.u76 not found
As software is ripped, shared, and compressed, small fragments—like a single sound table or a character sprite's hit-box—get lost. Version Mismatch:
Update your ROMs: Seek out a "MAME 0.241" (or newer) compatible ROM set. These newer sets include the required security chips for Midway games like MK4 and Cruis'n Exotica. The error message "461-mortal-k-4-25-u76
Mortal Kombat 4 requires the TMS320C32 DSP BIOS file (often named tms320c32.zip) to be present in your ROMs folder for the sound and logic to function.
Web Page Errors: For web-related errors: File Signature for Verification Pathing Errors: The system
The extension .u76 is not a standard Windows or game file type; it is almost certainly a reference to a specific file segment or a corrupted filename that the game's executable is trying to call. In MK4, the game relies on various data files (often with .dir, .pnm, or .mkm extensions) to load assets like textures, sounds, and character models. Why Is It Happening?
. It is often missing from older or "split" ROM sets because it was only recently "decapped" (extracted) and added to the official MAME requirements. Fixing the MK4 "U76.U76 Not Found" Error 1. Why is this file missing?