On Tue, 2 Jun 2020 16:58:03 -0500, Paul Gilmartin <paulgboul...@aim.com> wrote:

>I don't understand the table at:
>    https://homepage.divms.uiowa.edu/~jones/cards/codes.html
>
>The column labels 12, 11, 10, (blank) appear redundantly on the
>second and fourth quadrants.

You might find the chart on page 150.3 of
http://www.bitsavers.org/pdf/ibm/360/princOps/A22-6821-7_360PrincOpsDec67.pdf 
to be easier to understand. The prior page describes how to read it.

-- 
Tom Marchant

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