On 4 September 2013 09:41, Shmuel Metz (Seymour J.) <shmuel+...@patriot.net> wrote:
>>But Dynalloc did not exist until MVS, > > Not as a supported facility for user code, but it was there for use by > DAIR in TSO. As I recall, the interface was different. There was an SVC 99 in MVT, but it wasn't "dynalloc"; it was a TSO-only service routine between DAIR and DADSM and such, with a completely different parameter list and return values, and much less function. (Some Dynalloc functions were done in DAIR itself without calling the old SVC 99, e.g. allocation information retrieval.) A Dynalloc SVC 99 invocation requires that the high bit of R1 be on to show that it's the new format. Nowadays I believe SVC 99, when called with the DAIR-type list, builds a "modern" Dynalloc list and falls into Dynalloc processing. Since it was allowable to link-edit DAIR into one's program, this calling format is in theory supported forever. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
