Hi Dan,

From the compiler manual:

"One of the major differences between the previous versions of the 8051 IAR C/EC++
Compiler (version 5 and earlier) and this version is a substantial increase in code
efficiency. To achieve this, backward compatibility with the previous compiler versions
could not be upheld. This version of the compiler is incompatible with version 5 and
earlier versions both in syntax and in code."

Personally I suspect that they now have a common compiler for the various micros that they support.

Dennis