Hi Dave
Thanks for the reply.
I have tied this and still no Joy. The problem appears to be with Native Link / ModelSim Altera, which for some unknown reason keeps complaining about a multi language simulation. I've got no idea why this should be. If I run the TCL script for modelsim that references the the vho file, as you say, it's all fine. When I use native link to simulate more than just the IP core and include my code I get errors.
I've tried including just the VHO file rather than the .qip but still no luck. I've also tried using the nativelink tcl script in Quartus to all the IP cores simulation file to native link and still no joy.
I can see me needing to modify the example tcl file to include my code instead.
Any ideas anybody?
Thanks russell