Relay computers - OR functionality

From: Dwight K. Elvey <>
Date: Tue Sep 28 12:04:38 2004

>From: "Vintage Computer Festival" <>
>On Mon, 27 Sep 2004, Dwight K. Elvey wrote:
>> In my logic, 'A' would indicated the normally opened contact
>> an 'a' would be the normally closed contact for relay A.
>> I'll use + to indicate OR and . to indicate AND.
>You already lost me. You may as well have used ! and $ instead of A and
>P.S. C programming convention (which most people would relate to
>immediately) says that next time you should use & for AND and | for OR.

 I'm sorry, people doing logic have been using + and . a
lot longer than C has been using & and |. I specifically stated
what I would use. Look at most any pre-C math book and
you'll most likely see the + and . used for OR and AND.
 These are just symbols until one applies meaning to them. I
don't see the issue. One should be able to adapt to different
conventions because that is the way things will be represented
from different sources. I adapt and I hope others learn to
do it as well.
 I don't see the issue with using upper and lower case to
indicate normally close or normally open? What difference
does it make how one represents it?
Received on Tue Sep 28 2004 - 12:04:38 BST

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