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Thus, a new format was created for these in the CHD file. Compressed Hunks of Data, or CHD for short, are designed very specifically around the needs of mass storage media. Some arcade games, consoles, and PCs will require a CHD to run. As CHDs are already compressed, they should NOT be stored in a ZIP or 7Z file as you would for ROM images. 

Why do my Neo Geo ROMs no longer work? How do I get the Humble Bundle Neo Geo sets working? 

Recently the Neo Geo BIOS was updated to add a new version of the Universal BIOS. This was done between 0.171 and 0.172, and results in an error trying to load Neo Geo games with an un-updated neogeo.zip set. This also affects the Humble Bundle set: the games themselves are correct and up to date as of MAME 0.173 (and most likely will remain so) though you’ll have to pull the ROM set .ZIP files out of the package somehow yourself. However, the Neo Geo BIOS set (neogeo.zip) included in the Humble Bundle set is incomplete as of the 0.172 release of MAME. We suggest you contact the provider of your sets (Humble Bundle and DotEmu) and ask them to update their content to the newest revision. If enough people ask nicely, maybe they’ll update the package. 

It provides a means of recovering from, e.g.

• too high an overclock
• a typo in cmdline.txt
• an incorrect kernel=<filename> parameter
• an invalid display mode

without requiring a PC. (Obviously it won't help if you've deleted start.elf...) 

Connect pins 5 & 6 with a jumper or piece of wire.

If you are using these pins for your own purposes and want to avoid ending up in safe mode, add this to config.txt:

avoid_safe_mode=1

recalboxOS uses many awesome existing components, like EmulationStation2 as frontend, piFBA and Retroarch as emulators, RaspberryPI NOOBS as installation/recovery system.