IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> wrote on 04/14/2009 11:08:43 AM:
> I recall, and possibly erroneously at that, that Format 1 CCWs were > added into the processor architecture at the same time that MVS had > support added for real storage sizes greater than 16MB, which was > one of the main reasons for "expanding" with the new XA (expanded > architecture) that was first made available in 1983. Format 1 CCWs were added in XA (eXtended Architecture). Real storage sizes up to 64MB were implemented on 370 via IDAWs and two extra Page Table Entry bits. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
