Why does new Mame builds require new romsets?

[Nocta]

Hi everyone,

I'm actually trying to build a working Mame library but I encounter a lot of non supported roms with the new build (my romset is at least two years old).

I know that it's a common issue with Mame but I wonder why is this the case only with this emulator?

Thanks in advance.

[B2K24]

The newer dumps are more accurate when compared to how the real hardware works. One example of this is progress with CPS2 --> http://arcadehacker.blogspot.com/2017/03/a-journey-into-capcoms-cps2-silicon.html

 

There's also instances where MCUs are decapped/dumped so the simulation of it can be scrapped which changes which files are required for MAME

People should always upgrade their romsets and use the latest MAME.

[Nocta]

Thanks a lot for this technical explanation B2K24, I understand better now. Time for me to set up a new MAME library. 

[B2K24]

Here's a couple more fascinating examples of why romsets change and why you'd want to run the latest MAME

https://mamedev.emulab.it/haze/2017/07/17/ds5002fp-dumping/

https://mamedev.emulab.it/haze/2017/07/11/the-super-real-darwin-award/

[Nocta]

Thanks a lot B2K24, it's super informative, exactly the kind of info I needed.

Is there a way to know which of my games are still compatible with the newer version of Mame or do I have to redownload them all?

[B2K24]

There is a site that SentaiBrad calls the dome of pleasure. The easiest way to upgrade your set is to join a full post and point it to the collection that you already have. It will only download what has changed and then you can clean un-needed data with a software called T-check (it's on their forums)

 

I don't wish to break any rules here so I'm being careful and discreet about what I say here. I can probably give better answers if you PM me. You're welcome to do so :)

[Nocta]

Thanks again B2K24, you got a PM.

You're right, I don't want to cause any trouble here.

[morize]

Interesting read!