<snip> >From what I understood of the PC instruction: with 1 instruction you can now execute a 'function' that might have taken pages of assembler instructions before. </snip>
I'm not sure where this thought comes from. The PC instruction is not magic. It does not execute a "function" beyond the function of the instruction itself. It passes control somewhere, may change state, may create an entry on the linkage stack. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN