Add CHD support for Sega CD / TurboGrafx-CD / SuperGrafx

[msheehan79]

Recent updates to the lr-beetle-pce-fast, lr-beetle-supergrafx and lr-genesis-plus-gx cores added CHD support. Can these new extensions be added to the platforms.cfg for these systems and added to the wiki?

[joolswills]

Please provide more details - which extensions ? is it just .chd ?

[msheehan79]

Yes, just .chd (and .CHD) formats are now supported.

There are some discussions in the various libretro repositories:
libretro/Genesis-Plus-GX#93
libretro/beetle-supergrafx-libretro#22
libretro/beetle-pce-fast-libretro#62

In terms of space savings its pretty significant, finding about 50% compression vs. the standard bin/cue format, plus now everything is stored in 1 file instead of 2.

A useful post for users looking for info on how to convert their bin/cue files to CHD is on the Libretro forums: https://forums.libretro.com/t/chd-batch-for-newly-supported-systems/11673

You can find the chdman utility to convert these files included with the latest MAME distributions.

[Darknior]

Woaw great news :D
They write too Beetle Saturn ... it is not working fine today on PI but one day with PI XX it will ;)
I don't found if it is also available for other systems using ISO like 3DO.
So bad it don't permit to MERGE Multi-CD games like .PBP on PSX :(

[joolswills]

fixed in 0a3faa9 (I put wrong ticket # in the commit msg)