Nov 03, 2011, 11:21 PM I likes Electric Flies ! Pleasant Valley Modelport Joined Sep 2006 9,433 Posts Yea, 1+1=1, 0+0= 1 The + sign in boolean algebra is called Logical OR. say 1 = 5 volts, 0 = 0 volts. A two wire electronic OR gate with a 1+0 = 1, 0+1 = 1, 0+0 = 0 The 0+0 = 1 is an inverted input OR gate in which the output = 1 when either input is 0.
 Nov 04, 2011, 02:29 AM Registered User Joined Aug 2009 249 Posts off topic: a while back, my algebra professor wrote on blackboard 2+2=X students were asked to complete the equation. All of them who answered "X=4", some 10%, failed. catch was in the sign +. It is a matter of agreement that we use sign + for addition but that sign can represent any operation conceivable. It can represent division for instance and then the right answer would be X=1. While looking at modern algebra books, my kids study from, I can only cry and sob. And give them my old books.
 Nov 04, 2011, 05:57 AM I likes Electric Flies ! Pleasant Valley Modelport Joined Sep 2006 9,433 Posts Every generation, the kids get smarter. 30 years ago you could keep one happy for days or weeks on a 50 cent yoyo. Not so now, how much is that gamebox and games ?
Nov 04, 2011, 07:11 AM
EIEIEIO Classic is dway ta go!
Northeast Pa. .Heyna or No?
Joined Aug 2009
2,269 Posts
Quote:
 Originally Posted by Chophop Every generation, the kids get smarter. 30 years ago you could keep one happy for days or weeks on a 50 cent yoyo. Not so now, how much is that gamebox and games ?
Now that's a good joke !
Being smart has nothing to do with not learning how to be content!
Nov 04, 2011, 07:51 AM
Danish? Don't U eat that??
Denmark
Joined Jan 2008
256 Posts
Quote:
 Originally Posted by Chophop Yea, 1+1=1, 0+0= 1 The + sign in boolean algebra is called Logical OR. say 1 = 5 volts, 0 = 0 volts. A two wire electronic OR gate with a 1+0 = 1, 0+1 = 1, 0+0 = 0 The 0+0 = 1 is an inverted input OR gate in which the output = 1 when either input is 0.
Actually the correct way to write the NOR equation is !(0+0)=1......the "!" meaning NOT or INVERSE. Then there is exclusive OR/NOR, conjunction/disjunction, etc. ......http://en.wikipedia.org/wiki/Boolean_algebra

Dry reading, but you'd be amazed by how useful it is........I can be 100% sure that whereever you are, reading this, there is something using it within arms length of you.......
Nov 04, 2011, 07:55 AM
Registered User
Bonnie Scotland
Joined Jun 2004
847 Posts
Quote:
 Originally Posted by jteplane Upon entering the little country store, the stranger noticed a sign saying: “DANGER! BEWARE OF DOG!” posted on the glass door. Inside he noticed a harmless old hound dog asleep on the floor besides the cash register. He asked the store manager, “Is THAT the dog folks are supposed to beware of?” “Yep, that’s him,” he replied. The stranger couldn’t help but be amused. “That certainly doesn’t look like a dangerous dog to me. Why in the world would you post that sign?” “Because,” the owner replied, “before I posted that sign, people kept tripping over him.”
Reminds me of the Peter Sellers sketch. (Apologies for a video in the jokes thread.)

 Does your dog bite? (1 min 17 sec)
Nov 04, 2011, 09:55 AM
I likes Electric Flies !
Pleasant Valley Modelport
Joined Sep 2006
9,433 Posts
After working thousands of gates, we knew the shorthand version. Ahhhh I remember that first mainframe job, crunching through 10 flipflops gated with 5 or 10 gates on each flipflop leg of the circuits. I accepted automated test equipment with full understanding. A human is not meant to do that. But I spent 2 years gate busting like that.

Quote:
 Originally Posted by DKChris Actually the correct way to write the NOR equation is !(0+0)=1......the "!" meaning NOT or INVERSE. Then there is exclusive OR/NOR, conjunction/disjunction, etc. ......http://en.wikipedia.org/wiki/Boolean_algebra Dry reading, but you'd be amazed by how useful it is........I can be 100% sure that whereever you are, reading this, there is something using it within arms length of you.......
 Nov 04, 2011, 01:07 PM Fly by Night Phoenix, AZ Joined Jan 2007 872 Posts Lets not forget Karnaugh maps.
 Nov 05, 2011, 08:23 AM Danish? Don't U eat that?? Denmark Joined Jan 2008 256 Posts Or the joy of getting your first sequential logic machine to work.......ahh those were the days.......
Nov 05, 2011, 10:30 AM
I likes Electric Flies !
Pleasant Valley Modelport
Joined Sep 2006
9,433 Posts
I was straining but able to keep up with that and 8085 machine code while working a day job on satellite navigation systems. USCLA extension classes. I rarely used it , soon after , mega memory and MIPS were suddenly common and I do think lots of people got lazy from not really needing it so badly. And then also compilers came around.
I'll bet it is mainly used by semiconductor engineers these days. Or relay engineers. And I'll bet there are boolean simplification programs available. Remember, it's intelligence is limited to that of the software engineer who wrote it.
Mathcad took away my pencil rage. I used to work math problems out all the time. I got started on some differential equations and was sidetracked by a Motoman obsession.

# Images

Last edited by Chophop; Nov 05, 2011 at 10:41 AM.
 Nov 06, 2011, 03:49 PM Its all fun Australia, NSW, Forster Joined Oct 2004 7,248 Posts Well I used to find jokes in this thread, but now it is full of nerdy jerks showing that they listened to the teacher rather than ogled the good sort sitting in the row in front. I guess that is itself a joke.
 Nov 06, 2011, 04:11 PM Danish? Don't U eat that?? Denmark Joined Jan 2008 256 Posts These days if you need something to perform a task equal to a boolean system more complex than just a few tens of gates and/or F/F's either a PAL circuit or a tiny microcontroller is usually chosen. One PAL programming software i have worked with has both an automatic simplification routine per pushbuttom, and even some degree of automatic synthezisation based on the wanted input/output relation....... But just to do a somewhat scruffy attempt to try to get back on track: Why do mathematicians always confuse Halloween and Christmas? Because 31 Oct = 25 Dec EDIT: Ahhh, Tony has awaken......what took you so long? I'm surprized we were allowed to "nerd around" as long as we did.....
 Nov 06, 2011, 05:14 PM I likes Electric Flies ! Pleasant Valley Modelport Joined Sep 2006 9,433 Posts Ok , how about this Tony, I'm sure the whole world knows about the Power Ball lottery. But around here we have the Power Jaw. A 5 Hour Energy Booster and a pack of chewing tobacco. Speed Spit. Spit spit spit. Yuk ! I don't think I want a Power Jaw ticket. Last edited by Chophop; Nov 06, 2011 at 09:14 PM.
 Nov 06, 2011, 07:01 PM Don't look at me like that.... United States, AR, McDougal Joined Aug 2005 2,816 Posts Two salesmen had to spend the night at an old mansion when their car broke down. The rich ole-lady that owned the place said she would have the auto fixed by her private mechanic by morning. She fed them a lavish meal cooked by her personal chef and had the maid take them to beautiful rooms for the night. The next morning they were back on the road again. Several months later, back at the office, one of the salesmen gets a call. he walks down the hall into his buddies office and ask " Hey, remember when we brokedown last fall ?" Buddy " Yea " " Did you sneak out of the room in the middle of the night ?" Buddy " Yea" " Did you go to the Rich old ladies room ? " Buddy " yea" " Did you make love to her ? " Buddy " Yea" " Did you give her MY name ? " Buddy " Yea" " Well, she just died and left me everything."
Nov 06, 2011, 08:48 PM
Not THAT Ira
Coupeville, Wa
Joined Jan 2006
4,722 Posts
Quote:
 Originally Posted by 62pilot Two salesmen had to spend the night at an old mansion when their car broke down. The rich ole-lady that owned the place said she would have the auto fixed by her private mechanic by morning. She fed them a lavish meal cooked by her personal chef and had the maid take them to beautiful rooms for the night. The next morning they were back on the road again. Several months later, back at the office, one of the salesmen gets a call. he walks down the hall into his buddies office and ask " Hey, remember when we brokedown last fall ?" Buddy " Yea " " Did you sneak out of the room in the middle of the night ?" Buddy " Yea" " Did you go to the Rich old ladies room ? " Buddy " yea" " Did you make love to her ? " Buddy " Yea" " Did you give her MY name ? " Buddy " Yea" " Well, she just died and left me everything."
AAAAhahahahah! ROFLMAO!