
DREAMCAST EMULATOR MAC OS X FULL
These devices allow the playback of full GD-ROM dumps on original Dreamcast hardware. In more recent years, optical drive emulator devices have been created, which allow users to replace their GD-ROM drive with SD card or USB connectors. Currently, the project has verified over 1,400 GD-ROM dumps, encompassing the entire North American and European game library, as well as much of the Japanese library. Maddog is currently the maintainer of the Dreamcast branch of TOSEC ISO.
DREAMCAST EMULATOR MAC OS X ISO
After ackmed released the highly reliable httpd-ack GD-ROM dumping software, Dumpcast merged its efforts into the much larger TOSEC ISO project.

Dumpcast members began dumping and cataloging GD-ROMs, and soon the GDI format was established by Raziel's nullDC emulator. At the time, all Dreamcast emulator users played games on their PCs with hacked MIL-CD versions of games. The Dumpcast project was founded in 2007 by darc and az_bont as a project to catalog and preserve all published Dreamcast GD-ROMs. So you might want to download all three BIOS/flash files if you want full compatibility.Welcome to Dumpcast-the Sega Dreamcast GD-ROM dump database.
DREAMCAST EMULATOR MAC OS X PATCH
While nullDC can patch the IP.BIN on-the-fly (in RAM, it doesn't write to your disc images or anything) to have the JUE flags so you can run a game on any region BIOS/flash, some games with region enforcement will check the video output setting or region in the flash manually, and they will kick back to the BIOS. Note that one BIOS/flash might not be enough for you because of region restrictions. Nathan Keynes is doing a great job on it and it's the emulator I'm following most closely, because Nathan is very interactive with the community, and he has been working hard on OS X support at the request of a small few (and duh, I'm a Machead). If you're stuck on Linux or Mac OS X, try out lxdream, which is blossoming quite nicely. Not to disrespect Chanka, but I would highly recommend against Chankast, because everything that works in Chankast should work in nullDC with the Chankast plugins (included with nullDC).

Chankast (also Windows only) is what everyone used to use before nullDC, but it's outdated now, and doesn't except any type of file input, only input from a physical CD-ROM drive (unless you use a program to mount an image to a virtual drive), and as such, it doesn't support GDI files. NullDC was the first emulator to support the GDI file format (its developers actually made the format) and is the best DC emulator right now (Windows only, its developer hates Linux). Ideally, you will have a GD-ROM dump ("GDI") but old classical warez-style rips work as well, just they're ripped/hacked up/lower quality/not the original game disc. Besides the BIOS, you will obviously need a game.
