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1100 Multiply and Divide Fractional Instructions

From Stephen Boyd <sboydlns@gmail.com>
Newsgroups comp.sys.unisys
Subject 1100 Multiply and Divide Fractional Instructions
Date 2026-02-23 11:59 -0500
Organization A noiseless patient Spider
Message-ID <10ni12j$35m16$1@dont-email.me> (permalink)

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I am struggling understand why anyone would have thought that these 
instructions were needed. The manuals go through a lot of mumbo jumbo 
about implied binary points which I understand well enough. But what is 
the point of instructions that only make allowances for a single binary 
point? It seems to me that if one is going to have to scale numbers in 
this fashion you are most likely going to need more than 1 binary point 
and you will have to keep track of the scaling yourself in any case. 
Either that or just use floating point.

I'm perplexed.

Steve B

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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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