IBM Professional Series User Manual page 227

all interrupts or instructions are traced for that operand.
The codes specified in these operands are cumulative
until the respective table is full; an entry may not be
deleted from the table, but the table's contents can be
cleared by re-specifying the operand without the nn
option.
2. To resume operation of the virtual machine after
instruction execution has been halted with the NORUN
option, the BEGIN command must be entered.
3. The TRACE command can be used as an address stop
function by using the NORUN option.
4. Stores to a location which do not cause the storage to
change will not be detected by storage alteration trace.
5. Storage alteration trace is limited to any four (4)
consecutive bytes of storage.
6. If trace output is being recorded on the printer, a
CLOSE command must be entered to create the spool
file.
7. When recording trace output on the printer, the trace
output is intermixed with other data sent to the printer.
Responses: The following symbols are used in the responses
received from TRACE:
mnem
iii iii i i
bm
cc
code
mnemonic for the instruction
instruction (2, 4, or 6 bytes)
branch mask
condition code
interrupt code
TRACE ACTIVATED
tracing function activated
TRACE TERMINATED
tracing function terminated
7-54 VM/PC Users Guide