: Older, incorrect "overdumped" versions of these files were often larger, which triggers the error in modern, more accurate versions of MAME. Why This Happens
The error message typically occurs when using the MAME arcade emulator to run Capcom’s 1994 beat-em-up classic, Alien vs. Predator . It signals a mismatch between the ROM file size and what the emulator expects for that specific version. What is the "Incorrect Length" Error?
: Early "dumps" of arcade chips sometimes included extra "junk" data at the end. Modern MAME expects "clean" 1MB versions for avp.14m , 16m , 18m , and 20m .
Check the file size of avp.14m . If it is not exactly , it is likely an outdated version. 2. Check for Parent/Clone Dependencies
: Modern MAME is constantly updated for accuracy. A ROM set that worked on an older version (like MAME 0.139) might have incorrect lengths for a newer version (like MAME 0.2xx).
: Capcom CPS2 games like AvP often require a separate "QSound" BIOS file (e.g., qsound_hle.zip ) to function. How to Fix the Error
The most reliable solution is to ensure your ROM version matches your emulator version.
To resolve the avp.14m incorrect length issue, follow these steps: 1. Audit Your ROMset
There are three main reasons you might see this error for avp.14m :
SEEN ON
SEEN ON
