Problem starting BC.Exe in DOS 5.02

[TerryRitchie]

We are trying to run certain .exe programs on a IBM 486 running DOS 5.02 to make sure they are backwards compatible. When attempting to compile an QBasic 4.5 program with BC.EXE we get the following error and would like to know how to solve it.: 

Code: (Select All)

runtime error R6002
- floating point not loaded

Note: This is not a Windows error and we have all the necessary drivers loaded.

Are you attempting to execute a QB64 program on your 486 or do you have old QuickBasic software you are trying to compile?

If it's QB64 then it's not going to work. QB64 was never meant for DOS.

If it's original QuickBasic (Qbasic) source then the error is associated with the FPU (math co-processor). Do you have a 486SX or 486DX? The 486SX does not have a built in FPU but the 486DX does. Here are some switches for the basic compiler that may help to get rid of the error:

https://jeffpar.github.io/kbarchive/kb/043/Q43090/

There are a few switches that deal with floating point and FPU emulation.

You may also have a corrupt compiler. Here is the download for QuickBasic 4.5:

https://winworldpc.com/product/quickbasic/45

And the Microsoft Basic Compiler:

https://winworldpc.com/product/microsoft...ompiler-60