what do you mean "the near-complete source code to Princess Maker 1 and 2 was quietly uploaded to GitHub a few months ago and nobody noticed"
https://github.com/ritsuro/PrincessMakerPC9801
https://github.com/ritsuro/PrincessMaker2xPC9801
it seems to be with the permission of whatever remained of Gainax and/or whoever holds the copyright, but with a few conditions (the source code is MIT-licensed, but it is also requested that it not be used for commercial purposes without explicit permission)
the main omissions appear to be:
- music/sound drivers (a different programmer holds the copyright, so it's not part of this release)
- ending scripts (no spoilers!)
- internal development tools
- EXELOAD for PM2 is in a separate repository => https://github.com/ritsuro/exeloadPC9801
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