Yes, perhaps a month was optimistic. Looking back through my emails, I see it took me 5 months (in my spare time) to design my language and instruction set and

Yes, perhaps a month was optimistic. Looking back through my emails, I see it took me 5 months (in my spare time) to design my language and instruction set and develop the compiler and VM. After that I wrote the function libraries. This was the first (and only) compiler I've written, and I just bought a book on compiler construction to figure out how to do it. This was an object-oriented C-like language, which was general purpose. It took a few years of actually using the language to make it "instustrial strength". Writing a compiler is a lot simpler than people might think. I used "Practice and Principles of Compiler Building With C", which explains things very well. It seems to be out of print now.