Very nice read by Retrostuff.org about his first efforts in OS-9 on the CD-i 605T, read it here.
Retrostuff: "The Philips CDI605T is the last professional CD-i player with authoring / development capabilities. As every other CD-i player, it runs on CD-RTOS v1.1, a real-time operating system based on Microware OS-9/68K v2.4. Additionally, it features extended memory, an internal OS-9 shell, a floppy disk drive, SCSI, ethernet, RS-232C and printer ports. When compared to its predecessor CDI605, it was upgraded with a tray loading mechanism, a built-in DVC and a newer system ROM v1.3."
These professional players have an extra TOOLS menu. It lets you allocate additional 5 MB memory to RAM and/or ROM and change various development and emulation settings.
[Thanks, Retrostuff.org]