In <listserv%[email protected]>, on 11/28/2010 at 10:57 PM, Avram Friedman <[email protected]> said:
>http://www.miketaylor.org.uk/tech/oreilly/more-iefbr14.html >From one >of the two IBM co-authors >Note not part of the original OS spec added as an after thought Given the following quote, his memory is not reliable: There were three possible instructions that could be used to zero R15: ``Clear Register R15'', ``Subtract Register R15,R15'', and ``Exclusive Or Register R15,R15''. There is, of course, no "Clear Register" instruction. The third obvious instruction is LA. -- Shmuel (Seymour J.) Metz, SysProg and JOAT ISO position; see <http://patriot.net/~shmuel/resume/brief.html> We don't care. We don't have to care, we're Congress. (S877: The Shut up and Eat Your spam act of 2003) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
