Resolved: See next post.
I have a long program. The port of the Microchip F1 Evaluation Platform to GCB.
The issue I have is that I have an errant program when I remove one line of code - I need to output to the serial port (one character, once) to ensure stability of my variables (one which tracks the RTCC.).
I have posted the ASM files - please help me complete the port. I am so close to completing the project.
The issue was caused by an use of underdeclared word variables and then (within the code) executing a conditional test.
Moral.... declare variables.