I discarded early on emulating a complete machine, so I just emulated the 6502 CPU and focused on getting CC65 cross-compiler working with my machine. I'm impressed you managed to emulate the Apple II. Kudos!
Haven't tried cross compiling anything yet, sounds really cool. Nice work on the Mandelbrot demo!
And re:Mandelbrot... thanks! it took 2 hours and 13 minutes to render that Mandelbrot in ascii :) Because my design with external SRAM I have around 2.2464MHz free after dealing with the video generation (composite video timing is so expensive!), but the extra overhead of the compiler has to be added on top of that (plus fixed float point numbers in a 6502 emulated in an AVR...).
Don't know if the author was bragging or what, but it reminds me of the fact that Woz designed and created all of the hardware and software for the original Apple and Apple II. Nicely done for it's time. I wonder if anyone can create something would be equivalent to today's systems.
There's something about these old systems, you can fit the whole system into your mental working memory. Just can't do that with todays abstractions.