In a message dated 12/29/2007 2:13:19 A.M. Central Standard Time,  
[EMAIL PROTECTED] writes:

Documented or not, DIAG is heavily used, both in IBM and non-IBM code.  



One example:  I don't remember the CPU model, but in 1987 I  studied the 
microfiche for the various initialization modules of RMF.  A  Diagnose 
instruction 
was used to read the I/O configuration data stored on  a floppy diskette.
 
Bill  Fairchild
Franklin, TN



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