Guys: One thing I would like to point out because as a ISV we get this question a lot. Our STC (Started Tasks) are in Cobol using HLASM called suboutines. Customers as us about the very question you'all are asking, code we wrote is Cobol V4 has been upward compatible since z/OS 1.6 . The issues are usually new functions , etc. But we test the code against the various versions of z/OS to confirm the code works correctly and of course a QA cycle for certification.
Scott On Tue, Apr 7, 2020 at 9:14 PM Mike Schwab <[email protected]> wrote: > A vendor has to decide the minimum required hardware for his software. > IBM chooses the minimum for the versions of z/OS, z/VM, z/VSE, z/TPF, > and its other software. Cobol 5 requires PDSEs ,etc. A company might > have to run on older hardware if they have a DR site with an older > computer. 31 bit operating systems can run on processors up to z12. > z13 won't run them. S/370 virtual memory 24 bit address programs are > still running without recompiling. > > On Tue, Apr 7, 2020 at 3:54 AM R.S. <[email protected]> > wrote: > > > > W dniu 30.03.2020 o 00:40, Grant Steele pisze: > > > Impressed with the depth on this list from the contributors. I am > getting back into the z-series software and application development after > years of being in another domain. > > > > > > Here is a very broad question: when you guys/girls are moving your app > portfolio from one hardware platform to another (say, z14 to z15), to what > extend are the apps compatible with the new platform without recompilation? > > > > There are many answers, let me also do this: > > > > You said "Code". That could mean many different things, let's assume you > > mean application code, written in COBOL or PL/I. > > You also said "changing platform". Let's assume we talk about EC12 -> > > z15, or z13 -> z15, or z14 -> z15, but not ES9000 to z15 or AS/400 to > z15. > > In that case YOU DON'T HAVE TO RECOMPILE the code. It will work. > > However new compilers can give you better performance when you recompile > > the code with parameter "platform=z15". Note: such code will no work on > > older platform, but it will work on newer platform. The assumption is > > simple: it is likely you will move from current machine to next model. > > It is unlikely you will move back. > > > > -- > > Radoslaw Skorupka > > Lodz, Poland > > > > > > > > > > > > ====================================================================== > > > > Jeśli nie jesteś adresatem tej wiadomości: > > > > - powiadom nas o tym w mailu zwrotnym (dziękujemy!), > > - usuń trwale tę wiadomość (i wszystkie kopie, które wydrukowałeś lub > zapisałeś na dysku). > > Wiadomość ta może zawierać chronione prawem informacje, które może > wykorzystać tylko adresat.Przypominamy, że każdy, kto rozpowszechnia > (kopiuje, rozprowadza) tę wiadomość lub podejmuje podobne działania, > narusza prawo i może podlegać karze. > > > > mBank S.A. z siedzibą w Warszawie, ul. Senatorska 18, 00-950 Warszawa, > www.mBank.pl, e-mail: [email protected]. Sąd Rejonowy dla m. st. Warszawy > XII Wydział Gospodarczy Krajowego Rejestru Sądowego, KRS 0000025237, NIP: > 526-021-50-88. 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