I had a look through the code a couple of years ago when I found V6.0. Not a huge number of changes, generally timing and such like, probably to make it more stable.
I wouldn't bother checking a 6809 disassembly, as the SDS9 uses an 8031 :-)
I wouldn't bother checking a 6809 disassembly, as the SDS9 uses an 8031 :-)