Command Trace Area—eyecatcher “CMDTRACE”. The command trace records the last 10 calls to tableBASE in this region. This area is only present if the TRACE Status Switch (Switch 5) is set to Y. Each entry consists of a before and after image of the command area and TBPARM.
0000 CMTHEYEC DC CL8'CMDTRACE' eyecatcher 0008 CMTHSIZE DS AL4 Total size of CMDTRACE area 000C CMTHENTL DS AL4 Size of each entry (COMMAND + TBPARM) 0010 CMTHSTRT DS AL4 addr of first trace table entry 0014 CMTHNEXT DS AL4 addr of next trace table entry to use 0018 CMTHEND DS AL4 addr of end of trace table entries 001C DS AL4 Reserved for future use 0020 start of entries, each of which contains: +00 COMMAND AREA (length 72 bytes) +48 TBPARM (length 64 bytes)