Was SVC 99 the other name for the DAIR (dynamic allocation interface 
routine(s?)) or did it replace them?  I vaguely remember using DAIR 
decades ago.  Listings trashed/lost two moves ago.

In S229-3169-3 (1971Jul no release) SVC32 shows parm of R1-->UCB list but 
no mention of DSN, disp, etc.

IBM Mainframe Discussion List <[email protected]> wrote on 04/24/2007 
03:09:30 PM:

> Rick Fochtman wrote:
> > ----------------------<snip>---------------------
> > 
> >> On 4/24/2007 12:29 PM, Rick Fochtman wrote:
> >>
> >>> Before SVC-99, we still had SVC-34, but the setup was somewhat more 
> >>> complex and far less forgiving of errors.

> >> I suspect you meant SVC 32, not SVC 34.

> > ----------------------<unsnip>----------------------------
> > You're right, Walt. Good catch, and thanks for correcting my sometimes 

> > faulty memory. :-)

> However, IIRC SVC 32 only did DASDM space allocation. It did
> not build SIOT's, JFCB's, mark UCB's as allocated, etc. I think
> SVC 99 was added  to MVT (maybe OS/360 in general) just for TSO.
> Initially it was not a generally availble interface to allocation,
> but intended for TSO's use only.


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