Chris, I saw read flags as well....I did google - all I found with substance (on IBM-MAIN) was the fact that R1 is now set to an address valid in any mode (regardless of callers mode). IOW high order word is is cleared even if invoking pgm is unaware of that word.
I would hardly call this a problem--- R14 thru R1 are known to be transient....so what? -- Martin Pi_cap_CPU - all you ever need around MWLC/SCRT/CMT in z/VSE more at http://www.picapcpu.de
