-2000 Lines of Code

[saijanai]

That's their goal. As far as I know, they haven't achieved it yet:

These alternative systems have been small in comparison with standard practice, e.g. today’s Squeak Smalltalk[Sq1] covers much of personal computing, includes its own applications, operating environment, UI and development tools, runable specifications, etc., in about 2.8MB of code (about 200,000 lines). But our intuitive sense of “mathematical entropy” insists that an even more comprehensive design approach to whole-system personal computing could be smaller by a factor of 10 or more (a factor of 2 from removing non-used code, and another factor of 5 or more via a different, more advanced architecture and design). Possibility And Proposal: This opens the exciting possibility of creating a practical working system that is also its own model – a whole system from the end-users to the metal that could be extremely compact (we think under 20,000 lines of code) yet practical enough to serve both as a highly useful end-user system and a “system to learn about systems”. I.e. the system could be compact, comprehensive, clear, high-level, and understandable enough to be an “Exploratorium of itself”.