MPLAB/PBP Simulator

[MOUNTAIN747]

16F886, PBP2.60, MPLAB/PBP, Simulator

Greetings,

I am working on my first attempt at Modbus CRC16. I’ve decided to write the routine in ASM following a Modbus document on the calculation. SO it doesn’t look too bad for a starting point and now I would like to use MPLAB Simulator to find my faults.
The Simulator starts OK and I’m using the “Step Into” button to single step the program. Everything looks correct until I leave the PBP portion of the program which declares the variables and equates values then I hit the ASM routine and all progress stops. No matter what I do the simulator jumps completely over the ASM section as if I had used the “Step Over” button. Break points do not work as expected either.
Is this because I’m using MPLAB to compile PBP? Once upon a time I was much more efficient with the simulator but I stopped using ASM as primary code fifteen years ago. Is the failure my misunderstanding of the mix of PBP and ASM or is this a dead end when using MPLAB and PBP?

Anyone know what the problem is?

Wayne