[billbo911]

Originally Posted by RyanN

I know there has to be someone that has done this as it seems like it could be a common problem.

Here are my needs:
I need MPLAB v7.20 and the C18 Compiler v2.40.
I need MPLAB v8.10 and the C18 Compiler v3.10.



I'm trying to program VEX robots this week, so I have to use my v7.20 and v2.40 of MPLAB and C18.

I also need to program our FRC robot this week, and we use Kevin's code, and we need MPLAB v8.10 to open the file, and we have been using v3.10 of C18.

Yes it is possible. This is exactly how I run my laptop. I use version 2.4 for working with my Vex, and version 3.1 for working with FRC. I learned this little trick from Kevin Watson. It is actually a lot easier than you think. It is as simple as installing version 2.4, then renaming the mcc18 folder to mcc18_2.4. I then install mcc18 version 3.1. Now on my laptop MPLab will run with the compiler version 3.1 for use with FRC. What I want to program my Vex, I renamed the mcc18 folder mcc18_3.1, and rename the folder mcc18_2.4 to mcc18. Then my laptop is ready to use MPLab with version 2.4 of the compiler for use with Vex.
That is all there is to it.

I have been using version 8.1 of MPLab for both Vex and FRC. It works quite nicely in this configuration.