MVS had simulation for DAS in its program check handler, which allowed SP1.2 and its successors to run on machines which did not have DAS. DAS was first implemented via a microcode update on the 3033. It was never implemented on 158 and 168. Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY
"IBM Mainframe Discussion List" <[email protected]> wrote on 09/04/2020 06:47:52 AM: > From: "Greg Price" <[email protected]> > To: [email protected] > Date: 09/04/2020 11:45 AM > Subject: Re: Architectural Level Sets > Sent by: "IBM Mainframe Discussion List" <[email protected]> > I was very surprised when MVS/SP 1.2 ran on the 158 because I would have > thought that DAS required extra hardware that was not thought of when > the 158 was first designed and built. > > And also... > > Is not one of the main points of an ALS is that the the BCP (et al) > coders can assume that the newer instructions in place at that level can > be freely used within the object code of their components? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
