

i beleive there are programs that can convert them if you have the proper files. You will need to find roms for the version of mame you wish to run. The next guess is the rom sets you have are for a different version of mame, and the set has changed between the versions. CHD files are generally quite large, since they are hard drive images. (More details in MameDev FAQ: Why does MAME report 'missing files' even if I have the ROMs) I'm guessing you're getting the clone and not the parent, or don't have the bios. You can also find emulators and a section with BIOS files that is created just for. What it provides is legal 'public domain', original homebrew and freeware games. Transferring these ROM files individually may result in various technical hassles at a later point.
WHERE DOES MAME BIOS FILES GO ARCHIVE
As a general rule, you should compress all the BIOS files into a single archive before transferring them to the ROM folder.

This website does not offer any commercial (copyrighted) ROM Packs of games, BIOS files, or emulators for download. Where do I put Mame BIOS files BIOS and MAME ROMS The BIOS files you download need to be transferred to MAME’s ROM folder. most of these games dont run that well unless you have a very powerful pc.but some of them do. All rights for the files go to the official developers. Some games require a CHD file as well as the rom to run. Some roms require a bios rom in order for it to run, for example, NeoGeo games require the neogeo bios rom to be present in the roms folder in order for them to work. however the puckman rom can run just fine without the pacman rom, since it is the parent rom. in order to play the pacman rom, you need to also have the puckman rom.

for example pacman is a clone of puckman. Some roms are clones that require a parent rom to work. You need to have the right version of the rom that matches the version of mame you are wanting to use.
