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AND:   The result is true only when both A and B are true.
ABResult
1 1 1
1 0 0
0 1 0
0 0 0
 
 
OR:   The result is true if A or B are true.
ABResult
1 1 1
1 0 1
0 1 1
0 0 0
 
 
XOR:   The result is true if A != B.
ABResult
0 1 1
1 0 1
1 1 0
0 0 0
 
Computing Access-List and Wildcard Pairs
 
Bit Swap:   convert from canonical format to non-canonical format.
This works pretty great with 4 fingers on each hand, cross and flip.
 
Hex Inputae
Hex Output75
 
 
 
 
Memorize the bit patterns for contiguous ones and zeroes in an octet:
Octet-1Octet-2Decimal
0000 0000 0
0000 0001 1
0000 0011 3
0000 0111 7
0000 1111 15
0001 1111 31
0011 1111 63
0111 1111 127
1111 1111 255
   
0000 0000 0
1000 0000 128
1100 0000 192
1110 0000 224
1111 0000 240
1111 1000 248
1111 1100 252
1111 1110 254
1111 1111 255

Last update: Wednesday, 22-Sep-2004 16:13:29 PDT
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