T [addr]  - Trace User Code

This command single step traces program code from the address specified 
by the PC value, or addr, to the next logical address. Executing the 
command causes a SWI to be placed at the next executable address(es). 
If a command macro called TRACE has been defined, it is executed on 
completion of the T command.

A useful Trace macro is: 
     DASM *

If the next executable instruction involves a branch to the current address, 
the trace is disabled, to allow the instruction to execute.

However, PCbug11 will still display the TRACE state. Since the Talker is 
interrupt driven, this does not cause any hang-up of the monitor, and all 
PCbug11 commands are still available.

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