Why MDK 3.12 for PRC had release?

Now, mdk 3.12 for PRC had released,but keil not release mdk 3.12,why?
Why MDK 3.12 for PRC had release?

Now, mdk 3.12 for PRC had released,but keil not release mdk 3.12,why?
Compatibility between the C166-Compiler versions ( 3.xx <=> 4.xx )

I have a little question about the compatibility between the C166-Compiler versions : * 3.05 (uVision 1.24) and * 4.27 (uVision 2.38) - the actually version ===================================...
Compatibility between the C166-Compiler versions ( 3.xx <=> 4.xx )

I have a little question about the compatibility between the C166-Compiler versions : * 3.05 (uVision 1.24) and * 4.27 (uVision 2.38) - the actually version ===================================...
difference between version 4.0 and 5.0

I know I'm talking about very old versions, but I got a project that is build with the C51 compiler version 4.0. I don't have this version of the compiler, but I do have a version 5.0. However, when I...