Standard arcade games stored code in EPROMs. However, by the early 1990s, arcade manufacturers used (MCUs) with internal ROM. These MCUs ran code that the main CPU queried. You cannot emulate the MCU without dumping its internal program—hence the .bin file. The dl-1425 was a specific mask ROM inside an MCU.
: You may be using a ROM set from before version 0.186, which lacks the newer QSound BIOS files. The qsound_hle Change : As of MAME 0.201, the system introduced qsound_hle.zip mame dl-1425.bin
If you use a "merged" ROM set, the parent ROM contains dl-1425.bin . The clone (e.g., hookj.zip for Japan) may not contain it, expecting to read from the parent. Ensure you have the parent ROM ( hook.zip ) in your folder. Standard arcade games stored code in EPROMs
: It is typically found inside the qsound.zip or qsound_hle.zip device files in your MAME roms folder. You cannot emulate the MCU without dumping its
Users most often see this error after updating MAME to a newer version (0.186 or later) while still using an older ROM set. Because MAME is a "living" project that constantly improves accuracy, it occasionally changes the required filenames or file structures to match the original arcade hardware more closely. How to Fix dl-1425.bin Errors