On 2/14/2012 10:00 AM, Michael Black wrote:
[...] But I don't see what great new development happened with the III that helped the II line along. It was a separate branch, the never went further. Unless the failure of the III meant Apple went back to extending the II line in a more logical fashion.
The 80-column firmware was transplanted from the III to the IIe. As Brendan pointed out, ProDOS is a direct descendant of SOS.