Basic logic problem

From: Mike Turco (miketurco_at_yahoo-nospam4me.com)
Date: 07/10/04 

Date: Sat, 10 Jul 2004 14:12:29 -0700

I want a truth table as follows, where A and B are inputs, X and Y are
Outputs:

ABXY
0001
0110
1011
1111

I would like to use one chip to decode, such as a 74x02 quad two-input nor
gate. I've found two solutions. One is five gates, as shown at
http://www.miketurco.com/cae/gate1.GIF , which is one gate too many. The
other solution is to use a 74x138. I consider the 74x138 to be a cheat!

In going through this, I'm starting to realize how rusty I'm getting at
doing this kind of stuff.

I imagine there's an easy to see, simple solution to this problem. Please
enlighten me, I think my brain needs a kick.

Thanks,

Mike

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