Think of a standard arcade ROM (usually a .zip file) as the game's "brain"—it contains the code and instructions. A CHD file, however, represents the game's "hard drive" or "laser disc."
In the world of arcade emulation, stands for Compressed Hunks of Data . While standard arcade ROMs are usually just small dumps of silicon chips (ROM, PROM, or EPROM), CHDs represent much larger storage media that some arcade machines used to store high-fidelity data. Why do we need them? chd files for mame
(You’ll need a CUE file referencing disk.img.) Think of a standard arcade ROM (usually a
To force a specific version:
MAME needs the file to remain exactly as it is (usually ending in .chd ). If you try to extract a CHD, you will likely end up with a massive, unusable raw file. Why do we need them
for modern MAME (0.200+). Older CHDs may need conversion.
This is rare. Usually you start from an existing disk image.