[dexter1]

Will these new roms also be placed in the "roms" folder and need to add some option on the command line in the emulator mame?

These roms go in the "roms" folder, yes.
I added the command for starting mame with the indigo2 emulation, for the indy, use:

Code:

./mame64 indy_4610 -gio64_gfx xl24

Another thing, do you think normal indy battery is going to last so long? It's normal?

The variance in dead Indy clock batteries vary greatly: Some have their Indy battery replaced a decade ago, some are still running on their original Dallas 1386 from 20 years ago. As long as it runs, it runs. Besides, the clock battery rework featured by several people several times is a job of an hour or so and is relatively easy to do.

Has the optimization in compilation gone from 3 to 2, does this commence the execution speed, or does it cause a known problem because of the optimization?

Raising the optimzation from 2 to 3 does nothing in terms of performance and will only increase compilation time: This is because the MAME MIPSIII core, the slowest part of the emulation , doesn't respond well to optimization and is therefore currently the bottleneck.

I know that under certain circumstances, optimizations may not have the desired effect because of certain peculiarities in the target processor.

"Peculiarities" is a nice eufemism for bad compilers :-) Optimization totally depends on how good the compiler can determine and even predict program flow and make sensible assumptions on variable and register volatility. All compilers suffer from bugs in optimization, some more than others...
Also, compiler optimization cannot fix certain choices or errors in program design.

What is the actual mame version?

Freshest "git pull" from https://github.com/mamedev/mame