On Tue, Jul 4, 2023, 14:34 Paul Gilmartin < [email protected]> wrote:
> On Tue, 4 Jul 2023 19:02:47 +0000, Seymour J Metz wrote: > > >I'm not convinced that it would have been too expensive in OS/360. > > > It was considered so expensive that OPEN overlays the DDNAME in > the DCB, presumably to save 8 bytes of storage. The DDNAME is > unnessary after OPEN unless something goes wrong. > > But the original DCB is restored by CLOSE. Where is it kept in tnhe > meantime without using even more storage? > IIRC, you can chain chase from an open DCB to the TIOT entry. > -- > gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
