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 Forum index » Diversions » Perplex City Puzzle Cards » PXC: Silver Puzzle Cards
#227:(silver ivy set) NAND
Moderators: AnthraX101, bagsbee, BrianEnigma, cassandra, Giskard, lhall, Mikeyj, myf, poozle, RobMagus, xnbomb
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Grizy
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Joined: 19 Nov 2005
Posts: 89
Location: Preston, UK
Spoiler (Rollover to View):
When commenting on the confirmed answer please use spoilers.
They are provided so that we can all discuss a puzzle without spoiling it for those don't want to be given the answer.


If you are stuck with a puzzle, don't understand how it was solved, want to find out, why not try logging in on the forum. That shows others that you are a "signed up member" and allows them to PM you with further info.

Grizy gets off soapbox
Rolling Eyes

PostPosted: Sat Apr 22, 2006 11:59 am
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Ashin
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Joined: 22 Nov 2005
Posts: 140

 		Just for completeness:

A NAND gate is essentially an AND-NOT gate conjunction. So:

Code:

Input1     Input2     OutputAND     OutputNAND
0          0          0             1
0          1          0             1
1          0          0             1
1          1          1             0


Even though there are 3 primary logic gates (AND, OR, NOT), the way you actually make these gates out of transistors is not as straight forward. Each one requires 2-3 electrical lines, where as the AND and NAND gates take only 1 line. However, you can build XOR, NXOR, OR, and NOR gates quite easily from NAND gates. So for this reason, the NAND gate is THE building block for the modern computer (and for this puzzle).

PostPosted: Thu Apr 27, 2006 4:34 pm
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kizandtango
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Joined: 05 Feb 2006
Posts: 108

 		Heres the map
227.png
 Description   
 Filesize   143.66KB
 Viewed   174 Time(s)

227.png
_________________
Call me Kiz

PostPosted: Fri May 05, 2006 1:35 pm
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jazzychad
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Joined: 03 May 2006
Posts: 74

 		Wow.. what an incredible puzzle. I finally received the card and sat down to solve it. It wasn't that hard to solve, but the real question is...

How on earth do you construct a puzzle like that? It would take me a lifetime to make a puzzle work correctly like this one... I know Brian lurks around these boards.. any insight on how you did that??

PostPosted: Sat Jun 10, 2006 1:55 pm
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Seej
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Joined: 30 Nov 2004
Posts: 614
jazzychad wrote:
How on earth do you construct a puzzle like that? It would take me a lifetime to make a puzzle work correctly like this one... I know Brian lurks around these boards.. any insight on how you did that??

You take a degree in electronics and pay attention to the digital logic/Boolean algebra/finite-state machine parts of the course. It's not that difficult once you know how (and a damn sight easier to get your head around than analogue electronics, what with complex numbers and Fourier transforms and the like....).

The silvers all seem to require some fairly specialised knowledge, so it's difficult to really know how tricky the ones I don't know about actually are, but this one's fairly straightforward - I've designed more complex circuits myself without any trouble.

PostPosted: Sun Jun 11, 2006 9:31 am
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brennagg
Guest


 		nand
Spoiler (Rollover to View):
THE ANSWER IS ELEPHANT


Excellent card....circuit not too hard to figure out but very clever finish involved!!

PostPosted: Mon Oct 23, 2006 6:59 am
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Perplexed_Rug
Guest


 		I THINK I SHOULD TROUT MYSELF
(NAND GATE PUZZLE)
New here...so 'hi board'..

Right. Easy enough puzzle for an engineer although FORGOT to
Spoiler (Rollover to View):
do more than one iteration. once figuring out that I=111 O=T...duh


Now also if
Spoiler (Rollover to View):
PERPLEXED = perplexed in the answers; using any case for this should be wrong because ASCII 'A' does not equal 'a' in binary...so binary for 'the' = 011101000110100001100101 and the binary for 'THE' = 010101000100100001000101 - so Mind Candy requires a box of trout


PostPosted: Sat Dec 09, 2006 10:58 am
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