PAUS - pause before instruction execution

Usage:

paus [NN]

Description:

This command places the trace mechanism in a step mode. When this mode is enabled, the user will be returned to command level before the NNth+1 instance of each instruction which meets the tracing conditions is executed. NN, if not supplied, defaults to zero; this results in a single-step mode of operation. Thus, after printing the instructions, a question mark (?) will be issued indicating readiness to accept a command. When the next run command is given, the instruction will be executed and tracing will continue until the next instruction meeting the conditions is encountered. Note that the E command can be used if it is desired to simply execute the instruction and immediately return to command level.

Certain conditions can occur which prevent the trace mechanism from being able to enter command level before executing an instruction. When such a condition exists, it will be indicated on the output line; i.e., the following message will be appended to the line:

          ...CAN'T PAUSE

The various conditions which prevent the capability to pause are as follows:

Execution of an instruction which has been replaced by a breakpoint
Execution of the instruction(s) influenced by an XEC or XED instruction
Execution of an instruction having IDC or DIC modification
Execution of a TOV, TEO or TEU instruction which will result in a transfer.