MAME anyone?

[Alex]

Hi,
It's been some years since I played with MAME, but would like to try again.
I've got it installed and the few games from mamedev work, but how do I
install/run other ROMs?

I've found some that match my current version (0.262), but they still don't
work.

The procedure I'm following is to download the zip then copy to
/usr/share/mame/roms and run name like "mame defender" or "mame
milliped".
It results in something like this:

$ mame milliped
136013-104.mn1 NOT FOUND (tried in milliped)
136013-103.l1 NOT FOUND (tried in milliped)
136013-102.jk1 NOT FOUND (tried in milliped)
136013-101.h1 NOT FOUND (tried in milliped)
136013-107.r5 NOT FOUND (tried in milliped)
136013-106.p5 NOT FOUND (tried in milliped)
136001-213.e7 NOT FOUND (tried in milliped)
Fatal error: Required files are missing, the machine cannot be run.

However, those are the exact files within the zip file I've downloaded. I'm
thinking it's some kind of version compatibility issue, but I 1) don't know
how to determine which version the ROM is for and 2) ROMs I've downloaded
that claim to be for 0.262 also don't work.

Ideas greatly appreciated.
Thanks,
Alex