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Is it possible to write a very simple player ROM? I could see this making the process of running the cd-i emulator a lot less daunting to people who aren't quite as technically informed and wouldn't be able to figure out the whole nullmodem cable and cd-i'nterlink program. Though I'm certainly not suggesting anyone take on this project.

Writing a ROM is certainly possible, but it's not simple. You'd need to clone almost the entire OS-9 OS and reimplement the CD-i file managers and drivers specified by the Green Book...