- From the Assembler debug window, press 
                  		  B (Breakpoint) for a window to appear, containing four choices.
                  		
               
- Press 
                  		  2
                  		
               
- Specify up to two opcodes.
                  		
               
- Press 
                  		  Enter.
                  		
               
Note:  If you set a breakpoint on opcode 'SVC', you can zoom to each supervisor call in turn to check your macros.