If you want to avoid legal concerns entirely, consider using CHD files from homebrew games or open-source arcade projects that explicitly allow redistribution.
mame/ ├─ roms/ │ ├─ capwzd.zip (The parent ROM) │ ├─ capwzd/ (Folder matching the ROM name) │ │ ├─ cap-wzd-5.chd (The CHD file) Cap-wzd-5.chd Download
The Internet Archive hosts massive collections of "TOSEC" (The Old School Emulation Center) and "MAME CHD" sets. Search for: If you want to avoid legal concerns entirely,
: If you receive a "checksum error," your CHD file might be for an older or different version of MAME. It is recommended to use CHD files from a set that matches your current MAME version (e.g., a "MAME 0.226 CHD set" for MAME 0.226). Initialization It is recommended to use CHD files from
: If you are using an older emulator (like MAME4all or early RetroArch cores), you may need a Version 4 CHD or need to use the chdman tool to convert the file format.
) on the MAME emulator. This file contains the disk image data for the game, which was originally released on Capcom's CPS-3 hardware in 1996. Technical Overview