On Tue, 15 Jan 2019 22:57:28 +0000, Seymour J Metz wrote:

>IBM never upgraded TSO/E for the REXX standard. I see nothing in z/OS TSO/E 
>REXX Reference Version2 Release3, SA32-0972-30 about built-in variables TRUE 
>and FALSE.
>
>More important, IMHO, is that IBM did not add the ANSI extensions to ADDRESS.
>>
>>http://www.rexxla.org/rexxlang/standards/ has ordering information and links. 
>>At $125, I'd just go for the draft, but it's probably worth it if you're 
>>trying to implement ANSI-compliant Rexx (sic).
>>
>(direct link: http://www.rexxla.org/rexxlang/standards/j18pub.pdf
>)
Are you thinking of constructs such as:
    'ADDRESS' taken_constant [expression]  [ 'WITH' connection]]

Intriguing.  Seems to be specifying redirection.  Pointless for CMS or TSO
since the concept of standard input/standard output is alien to each.  Relevant,
of course, to OMVS, but OMVS was unable to exert much influence on the
design of z/OS Rexx.

I wonder how this made its way into the Standard since standards tend to
be descriptive and rarely innovate extensions except to resolve ambiguities
or inconsistencies.

Perhaps from Amiga?  OS/2?  AIX?  SAA?

-- gil

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