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Re: 1100 Multiply and Divide Fractional Instructions

From	Stephen Fuld <sfuld@alumni.cmu.edu.invalid>
Newsgroups	comp.sys.unisys
Subject	Re: 1100 Multiply and Divide Fractional Instructions
Date	2026-03-12 07:31 -0700
Organization	A noiseless patient Spider
Message-ID	<10ouinq$238sb$1@dont-email.me> (permalink)
References	(5 earlier) <10on4k4$8qs6$1@paganini.bofh.team> <10op9tc$agda$1@dont-email.me> <10oq0ot$jngm$1@paganini.bofh.team> <10osnaj$1f9sm$1@dont-email.me> <10otutv$162ic$1@paganini.bofh.team>

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On 3/12/2026 1:53 AM, R Daneel Olivaw wrote:
> Stephen Fuld wrote:
>>
>> #14 worked in Exec levels 31 and prior because the Exec kept the TAL 
>> (Type and Level) of whatever was currently executing in Exec R14, 
>> which could be read, but not written, by a user program.  The Type of 
>> a demand run was 4 versus 6 for a batch run.  But in Exec 33, when TIP 
>> was integrated into the Exec, the definition was changed such that the 
>> type of a TIP transaction was 4, and demand was changed to 6, the same 
>> as batch, so the trick no longer worked.  BTW, since TAL, and ER14 
>> usage was internal to Exec, the change was not documented, and this 
>> broke programs that relied on it.
>>
> 
> The values are in A4 when a program starts.
> 04 is Demand
> 05 is Deadline Batch
> 06 is Batch

Yes, that is explained in the "trick".   But as also explained there, if 
you are writing say a subroutine library that might be called by either 
a batch or demand program, A4 was probably used by that program long 
ago, so you can't depend on it any more.



-- 
  - Stephen Fuld
(e-mail address disguised to prevent spam)

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1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-02-23 11:59 -0500
  Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-02-23 18:22 +0100
    Re: 1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-02-23 14:27 -0500
      Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-02-23 21:27 +0100
        Re: 1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-02-24 10:32 -0500
        Re: 1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-03-09 14:30 -0400
          Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-03-09 19:47 +0100
            Re: 1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-03-10 10:29 -0400
              Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-03-10 22:00 +0100
                Re: 1100 Multiply and Divide Fractional Instructions Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-03-11 14:37 -0700
                Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-03-12 09:53 +0100
                Re: 1100 Multiply and Divide Fractional Instructions Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-03-12 07:31 -0700
                Re: 1100 Multiply and Divide Fractional Instructions R Daneel Olivaw <Danni@hyperspace.vogon.gov.invalid> - 2026-03-12 15:50 +0100
                Re: 1100 Multiply and Divide Fractional Instructions Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-03-12 12:03 -0700
      Re: 1100 Multiply and Divide Fractional Instructions Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-02-23 12:54 -0800
        Re: 1100 Multiply and Divide Fractional Instructions Stephen Boyd <sboydlns@gmail.com> - 2026-02-24 10:33 -0500

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