The is a collection of system files required to emulate the hardware of specific arcade boards. Just like a PC needs an operating system to boot, arcade hardware needed firmware. Without these files, the emulator doesn't know how to "speak" to the hardware.
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These packs usually contain .zip files that act as the "operating system" for the arcade hardware. Common files include: The is a collection of system files required
Your neogeo.zip lacks the UniBIOS. Fix: Download a "new" pack that includes uni-bios_2_3.rom . Then, in MAME's in-game menu (Tab key), go to Machine Configuration → BIOS → Select UniBIOS v2.3 . in MAME's in-game menu (Tab key)