Quote Originally Posted by glitch View Post
William Colley III's A85 is the closest I've found, Herb has a version with modifications to get it building under modern C compilers:

http://www.retrotechnology.com/restore/a85.html

I'm currently using that for most of my development. I've done a little customizing to it, I need to get it documented and up somewhere for download.
*cough* github *cough*