Alt-BEAM Archive

Message #12470



To: beam@sgiblab.sgi.com
From: "Timothy Flytch" flytch@hotmail.com
Date: Fri, 24 Mar 2000 14:41:22 PST
Subject: [alt-beam] Re: Check this


>Christopher Kettell wrote:
> >
> > Did anyone else have fun with TIMS's links ???
>
>Nope, didn't open it. I'm curious though, what was it?
>
>Bruce

I'm curious too :) I just never trust someone with that name... most of
them are a**holes... LOL...

Timothy...
______________________________________________________



12471 Fri, 24 Mar 2000 15:23:22 -0800 [alt-beam] Re: Logic puzzle - cool! Try this tougher one... :-) "'beam@sgiblab.sgi.com'" Wilf Rigter

And use this XOR for a positive signal if only one of the switches is
opened.

wilf

<>

> -----Original Message-----
> From: Wilf Rigter [SMTP:Wilf.Rigter@powertech.bc.ca]
> Sent: Friday, March 24, 2000 1:12 PM
> To: 'beam@sgiblab.sgi.com'
> Subject: RE: Logic puzzle - cool! Try this tougher one... :-)
>
> Here is a discrete XOR gate:
>
> <>
>
> > -----Original Message-----
> > From: Justin [SMTP:JAF60@student.canterbury.ac.nz]
> > Sent: Thursday, March 23, 2000 11:19 PM
> > To: beam@corp.sgi.com
> > Subject: Logic puzzle - cool! Try this tougher one... :-)
> >
> > If enthusiasm has waned, or it's too tough , I guess I'll
> > have to use an XOR chip.
> >
> >
> > If you're interested in what this bizarre gate is for, it's like this:
> > A motor controlling an extra leg articulation needs to be turned on and
> > off, and have its direction controlled by from specific combinations of
> > the two switches. The outputs go to separate 240 enable pins, one bank
> > of inverters acts as motor drivers (thus this output controls when the
> > motor is on) and the other bank acts as a reverser, switching the signal
> > before it enters the drivers, thus controlling the direction the motor
> > turns. Both input switches are normally closed. The motor should turn in
> > the direction of an open switch, thus it should stop turning when both
> > or neither switch is open. There might be a much easier way to do this,
> > as I haven't been getting much sleep... :-) << File: puzzle2.gif >> <<
> File: xor.gif >>



Attachment: xor1.gif

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