ikariwths wrote: ↑Mon Feb 28, 2022 7:14 am
Good morning everyone, I have downloaded the full set 0.240 non merged for mame, I can also download the chd which however I see that they are 500+giga.Are they different games? Does it make sense to download all these files?More I ask because I see that chd is for merged full sets while I have non merged.
Most games which require CHDs also have BIOS/MACHINE rom requirements.
CHDs really cannot be merged, although in some instances different versions of a machine which has different physical roms share the same CHD between them. Can't help you much beyond that.
You can read about ROMS and CHDs at
https://docs.mamedev.org/usingmame/aboutromsets.html