SYSALLDA will also work - see 
https://www.ibm.com/docs/en/zos/2.5.0?topic=up-subparameter-definition-1

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Von: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> Im Auftrag von 
Itschak Mugzach
Gesendet: Mittwoch, 20. März 2024 09:54
An: IBM-MAIN@LISTSERV.UA.EDU
Betreff: Re: [IBM-MAIN] TSO ALLOC with/wo unit

Agree, but it is common to use the devtype 3390.

*| **Itschak Mugzach | Director | SecuriTeam Software **|** IronSphere
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On Wed, Mar 20, 2024 at 10:52 AM Mike Schwab < 
000005962a42dc49-dmarc-requ...@listserv.ua.edu> wrote:

> UNIT is defined in the I/O gen and is customized by each site.  3390,
> SYSDA, etc may or may not be present.
>
> On Wed, Mar 20, 2024 at 1:57 AM ITschak Mugzach
> <000005a7ced721d8-dmarc-requ...@listserv.ua.edu> wrote:
> >
> > I have a program in Rexx that allocates a dataset using dsname and
> > volume serial (1) . it works well in my shop but requires a unit
> > type (2) in another shop. Actually the error is msg "IKJ56241I
> > SPECIFIED UNIT IS UNDEFINED".
> > Why does 1 work here and fails in another shop?
> >
> >    1. ALLOC F(XXX) DA('dsname') VOLUME(volser)
> >    2. ALLOC F(XXX) DA('dsname') VOLUME(volser) UNIT(390)
> >
> > ITschak
> >
> > ITschak Mugzach
> > *|** IronSphere Platform* *|* *Information Security Continuous
> > Monitoring for z/OS, x/Linux & IBM I **| z/VM coming soon  *
> >
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>
> --
> Mike A Schwab, Springfield IL USA
> Where do Forest Rangers go to get away from it all?
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