[Coco] CoCo & CoCo OS-9 C compilers

[alsplace at pobox.com]

Two questions/comments:

1) What was the difference between the C compiler for CoCo OS-9 sold by 
Radio Shack, and the later version?  One was a one pass compiler, the 
other was a two-pass, but now I forget which was which.

2) The RS-DOS C compiler -- I know it resurfaced for sale a few years 
back after the end of Rainbow and such.  Who has control of it these 
days, and did it have any potential in being used/udpated for OS-9?

     -- Allen