6809 v2

I've uploaded the preliminary sdcard.asm source edit.  It won't build due to undefined labels and a few typos have already been corrected

It's interesting to see how I can optimize the code even though I'm very new at 6809 assembly.

As S-BUG is working reasonably now, The next step is to move on to SD-Card access.  @Dolo is generous enough to allow his SD-Card code to be used as a framework for the 6809v2 project.  Make sure you check his projects out.  Thanks Dolo!