[Default] On 18 May 2021 17:15:54 -0700, in bit.listserv.ibm-main ponce...@bcs.org.uk (CM Poncelet) wrote:
>With all due respect, anyone who has difficulty coding JCL COND= >statements should consider *not* working with IBM mainframe systems. as someone who had to play cute games with COND= I would consign the designers of it to the same hell as the designers of Little Endian which I consider to be store scrambled. This latter idiocy means that there has to be big-endian UTF-16 and little-endian UTF-16. Clark Morris > >All boolean conditional execution steps can be handled using only COND= >statements. I submitted a paper on this & it was published in >"Computing" in 1989. I would but cannot attach it, as uploading PDF >files to this discussion list is not permitted. > >No sysprog worth his salt has ever had a problem with coding JCL COND= >statements. > >Likewise IF/THEN statements belong in "JCL for dummies" - as do symbols >in JCL and SYSIN. Ditto IF/THEN <etc.> in assembler. > >Chris Poncelet (r) > > >. >On 18/05/2021 14:02, Charles Mills wrote: >> Yeah, and IF/THEN is slightly better than COND= >> >> Also symbols in SYSIN data. >> >> Charles >> >> >> -----Original Message----- >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On >> Behalf Of Steve Horein >> Sent: Tuesday, May 18, 2021 5:35 AM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: Best catch up resources for MVS / ZOS Technologies >> >> I would argue JCL got better when symbols were allowed! :-) >> https://www.ibm.com/docs/en/zos/2.4.0?topic=es-symlist-parameter >> >> On Mon, May 17, 2021 at 10:46 PM Charles Mills <charl...@mcn.org> wrote: >> >>> Steve, let me wade in here and suggest some big picture. I think SHARE and >>> such is great for the details. >>> >>> What has changed since 2001? An idiosyncratic, IMHO list: >>> >>> - In 2001 SNA was yielding to TCP/IP. That transition has continued. An >>> awful lot of mainframe connectivity is now TCP/IP. Lots and lots of >>> Internet connectivity to the mainframe. >>> - Security is huge. Encryption is hot. Zero Trust is the buzzword of the >>> month. >>> - Everything is of course bigger. Z hardware goes up to what? 4TB real? >>> Someone will correct me if that is wrong. >>> - Tape drives have pretty much gone away. They live on as virtual, >>> emulated-on-DASD tape drives. >>> - The Cloud. Read any airline magazine for the latest. >>> - Remember VM? It was pretty moribund in 2001. It has found new life >>> hosting thousands of Linux instances. Yes, Linux running like a champ on Z >>> hardware. Mainframe Linux is huge. You can run Linux in a region of MVS in >>> a "container." >>> - Speaking of which, there is a Z box that will not IPL z/OS! It is called >>> Linux One. It's a mainframe with a bit hobbled somewhere such that >>> mainframe operating systems will not IPL, only Linux. >>> - Lots of new features in core MVS but you would fully recognize the >>> environment. If you sit down at a TSO/ISPF session it will seem like >>> nothing has changed. JCL has not gotten any better (or any worse, >>> thankfully). >>> - Remember the issue of "above the (24-bit) line"? It is still there, but >>> pretty much in the background. The new thing is data and execution "above >>> the (2GB/31-bit) bar." Lots of software products are exploiting data above >>> 2GB, and code can even run there, with lots of limitations. AMODE/RMODE 64. >>> - IBM JES3 is dead. Long live Phoenix JES3 plus. IBM ditched JES3, and >>> Phoenix picked it up. >>> - More emphasis on high level languages. Hardware design is being driven >>> by the Java folks and the compiler folks. Lots of new hardware >>> instructions. Hardware cycle times are not getting any faster, but >>> instructions do more per cycle. Caching getting more sophisticated and more >>> critical. The concept of "how long does an LR take" has totally >>> disappeared. It is a question with no answer other than "it depends." >>> >>> Anyone else want to weigh in? >>> >>> Charles >>> >>> >>> -----Original Message----- >>> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On >>> Behalf Of Gibney, Dave >>> Sent: Monday, May 17, 2021 6:58 PM >>> To: IBM-MAIN@LISTSERV.UA.EDU >>> Subject: Re: Best catch up resources for MVS / ZOS Technologies >>> >>> I would suggest SHARE presentations and perhaps Marna Walle's migration >>> guides >>> >>>> -----Original Message----- >>>> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On >>>> Behalf Of Steve Estle >>>> Sent: Monday, May 17, 2021 6:42 PM >>>> To: IBM-MAIN@LISTSERV.UA.EDU >>>> Subject: Best catch up resources for MVS / ZOS Technologies >>>> >>>> Hello Everyone in Mainframe Land, >>>> >>>> I've been out of the mainframe world since about 2001, but spent the >>> prior >>>> 20 years immersed in that world working with everything from MVS/370 to >>>> MVS/ESA and VM, performance and capacity planning disciplines across a >>>> variety of situations in the IT Services and consulting spaces. I, am, >>> now as a >>>> "IT Infrastructure Engineer- IBM z/OS Mainframe Engineer" after nearly 20 >>>> years of other activities (Project Mgmt, entrepreneur, etc) am about to >>>> potentially come back into a new mainframe role and I need to catch up as >>>> quickly as possible. Any suggestions on ways to fill in the gaps for >>> ZOS, ZVM, >>>> hardware, performance, etc? Bottom line I'm looking for that gap >>> education >>>> to as quickly as possible get up to speed with changes in platforms >>> since 2001. >>>> If prefer to call - all my info is below. >>>> >>>> Thanks, >>>> Steve Estle >>>> 303-604-0925 >>>> sest...@gmail.com >>>> >>>> ---------------------------------------------------------------------- >>>> For IBM-MAIN subscribe / signoff / archive access instructions, >>>> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >>> ---------------------------------------------------------------------- >>> For IBM-MAIN subscribe / signoff / archive access instructions, >>> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >>> >>> ---------------------------------------------------------------------- >>> For IBM-MAIN subscribe / signoff / archive access instructions, >>> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >>> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN >> . >> > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
