The "461-mortal-k-4-25-u76.u76 not found" error in MAME indicates a missing PIC chip ROM dump (PIC16C57) necessary for emulating the Mortal Kombat 4 Midway Zeus hardware platform. This error typically occurs when using an outdated ROM set that lacks the required file, requiring an update to a version that includes this specific, decoded security chip data. For more technical details on the file, visit GitHub. mame/src/mame/midway/midzeus.cpp at master - GitHub
. 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? 461-mortal-k-4-25-u76.u76 not found
If this is firmware, re-apply the v4-25 update package to overwrite missing components. 3. Disk Maintenance The "461-mortal-k-4-25-u76
The error 461-mortal-k-4-25-u76.u76 not found is a data integrity issue where a specific asset bundle required for version 4-25 is missing. It is rarely a hardware failure and is almost exclusively solved by re-acquiring the file through verification tools or whitelisting the directory in security software. Corrupted System Files : Corrupted or missing system
(MK4). Modern arcade emulators like MAME require this specific file to authenticate and boot the game. Technical Profile: 461-mortal-k-4-25-u76.u76 Role: Security/PIC chip data.
System Logs: Technical "papers" or reports on system stability sometimes use this specific error as an example of data integrity issues. How to Fix It To resolve the "not found" error, you typically need to:
Merged Sets: These contain all versions (parent and clones) in a single zip file. This is the easiest way to avoid missing file errors.