> > It's already there. You can shave off about 12 GB or so on a full 145 set that is > > rebuilt using 7-zip. > > do you mean that mame 0.145 recognizes 7z files by default?
No.
MAME 0.145 is what was put out for MAME's 15th Anniversary. The stuff you are talking about, .7z support, is a work-in-progress and may or may not be 100% when the next U release is made. The savings are based on what people are reporting they are saving with converting a full romset to .7z.