Relay computers - OR functionality - symbology

Contemporary messages sorted: [ by date ] [ by thread ] [ by subject ] [ by author ] [ by messages with attachments ]

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Tue Sep 28 21:17:51 2004

>From: "Patrick/VCM SysOp" <patrick_at_vintagecomputermarketplace.com>
>
>> Why didn't they use * or X for AND then?
>
>The period is a convenient substitution for a dot that was used in math to
>indicate multiplication (the "real" symbol is usually represented as more
>vertically centered within the character cell). I have some books that also
>use "x", but that character is again a more (or sometimes less) stylized
>glyph than the simple upper- or lowercase "X".
>
>By the way, that plus (or) symbol in those same books is often a plus inside
>a circle. So I suspect the use of plain-old-plus is again a convenient
>substitution into ASCII.
>
>Patrick

Hi
Most times, a plus in a circle is to indicate an exclusive-or.
Dwight
Received on Tue Sep 28 2004 - 21:17:51 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:37:32 BST