Ted MacNEIL wrote:
No. System z still IPLs in ESA/390 mode. A SIGP instruction must be explicitly
issued by the operating system to switch into z/Architecture mode.
Then why does SAPR say minimum of z/OS 1.4 with PTFs?
Because that was the oldest z/OS operating system currently in support
at the time the hardware became available. What has that to do with
whether the hardware supports the ESA/390 architectural mode??
Also, while bi-modal exists, it stops at 1.5.
Both 1.4 & 1.5 go out of support on APR01.
Exactly! You're making my point! z/OS 1.4 and 1.5 run just fine in
ESA/390 mode on System z processors!
Also, keep in mind that z/OS is not the only mainframe operating system
on the planet. For example, VSE/ESA 2.7 and z/VSE 3.1 run exclusively in
ESA/390 mode and -- according to the SAPR -- do so on System z
processors. z/VSE doesn't begin to execute in z/Architecture mode until
release 4.1.
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
http://www.phoenixsoftware.com/
----------------------------------------------------------------------
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
