all of color.com compileable from assembly

one of the difficulties an experimenter runs across when compiling color.com from source was that only the first 12K assembled, and even that had many differences from the color.com downloadable from colorforth.com. where is the rest?

now you can see the full sources, decompiled from the 2001 color.com image. look at the Makefile in the "as" subdirectory for details.

Next step in my plan is to get non-DMA writes to work (and/or fix DMA code in boot.asm).