The CD-i player 600 series, which includes the 601, 602, 604, 605, 615, 660, and 670 models. The 600 series is designed for professional applications and software development. Units in this line generally include support for floppy disk drives, keyboards and other computer peripherals. Some models can also be connected to an emulator and have software testing and debugging features.
Source: Wikipedia, "CD-i", available under the CC-BY-SA License.