Differences between compiler versions

Hello, I've got a problem with the compilation of a programm with Keil C51 v6.14. Perhaps someone has an idea, which might help me. The Problem: We've got a sourcecode, from a third party person...
Differences between compiler versions

Hello, I've got a problem with the compilation of a programm with Keil C51 v6.14. Perhaps someone has an idea, which might help me. The Problem: We've got a sourcecode, from a third party person...
Difference between the BL51 linker and the LX51 linker

What is the advantage/disadvantage of using LX51 over the BL51?
Difference between the BL51 linker and the LX51 linker

What is the advantage/disadvantage of using LX51 over the BL51?
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...