Just for exploring? Copy an IPL volume for testing purposes. ZZSA is a good program for reading (and emergency in place updates). Included on TK3 CD-Rom. https://www.youtube.com/watch?v=0ELZGZhyipg Moshix using ZZSA.
Cyl 0 Trk 0 IPLable volume first record is 3 card reader (initial CCWs) of the IPL text on that volume. https://www.ibm.com/docs/en/zos/2.1.0?topic=labels-direct-access-storage-device-architecture Stand alone tool kit to run programs on bare metal. https://github.com/s390guy/SATK On Tue, Feb 13, 2024 at 9:42 PM Tony Harminc <[email protected]> wrote: > On Tue, 13 Feb 2024 at 13:19, Charles Mills <[email protected]> wrote: > > > I am interested in writing a program to read the IPL records from a DASD > > volume. (Read only, not update). I am comfortable with XDAP but how do I > > OPEN a "dataset" that would include cylinder 0? > > > > > APF, OPERATIONS and so forth are not out of the question. > > > > You'll certainly need APF. > > There are many routines that do this kind of thing on the CBT tape that you > could use to get the idea or as a model or perhaps even reuse. Some of the > code is very old, and doesn't support new-fangled stuff like DSNTYPE LARGE > and extended volumes and such. But to read the IPL records probably code > from 1972 onwards will work. > > Try, for example, program CHRDUMP in file 558. > > Tony H. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
