POST is one of the macros that got it right with respect to level of indirection.. Unfortunately there are many that got it wrong (and that cannot be changed for compatibility reasons). A lot of these macros also document poorly what you put in the reg if using reg notation.
If the keyword is ASCB, then what you specify should be the ASCB (or its address in a reg). If the keyword is ASCBADDR, then what you specify should be a field that contains the address of the ASCB. You can debate for this second case whether what you put in a reg if using register notation is the address of the word or the address of the ASCB. I use "debate" a bit loosely because, while you can have the discussion, you won't change the way newer macros choose to do this -- they use the consistent approach of "if you specify the xxx, then what you would put in the reg is the address of the xxx". So if you specify the ASCB, what you put in the reg is the address of the ASCB. If you specify a word that contains the address of the ASCB, then what you put in the reg is the address of the word that contains the address of the ASCB. I think of it as the expansion doing either "LA / ST" or simply "ST" depending on which notation form you have used. "Really nice" macros give you both choices (for example, if POST were such a macro, it would support both ASCB and ASCBADDR as mutually exclusive keys, and then depending on your needs you could get what you want). Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
