| 
 | 
| MATINAT looks to be an excellent debug 
tool. It will materialize the instruction of a running 
pgm, including ptrs to the actual operand data.  Combined with a trace 
handling pgm, a standalone trace pgm could be written that would show each mi 
level instruction executed in a pgm and show the data value of each 
operand. Am I correct on this? Is this instruction an MI original? It must have taken some effort to write it.  Was it used 
as a debug tool by the os developers? -Steve | 
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