computers

 Positive Logic, Negative Logic Explained using Doors & Switches

In this animated AND Logic example of Doors Opening and Closing, you can see that in order for the "Light" to get through the house, the front door AND the back door must be Open. 

Same example: if either the front door OR the back door is Closed the light does NOT get through.  In this animated OR Logic example, you can see that in order to get light through the house: the left front door OR the right front door (or both) must be Open. 

Same example: in order to block the light through the house: the left front door AND the right front door must be Closed. In order for the Output of an AND Logical Function to be TRUE: input (1) AND input (2) must both be TRUE.  This is Positive Logic. Hint: TRUE is when the switch is closed,  applying power to the LED.  FALSE is when the switch is open,  NOT applying power to the LED)

 

Truth Table-> A & B are the Input switches AND TT C is the Output LED

Using the Same Function --It is also correct to say: If either input (1) OR input (2) (or both) is NOT TRUE the Output Will be FALSE. This is Negative Logic. In order for the Output of an OR Logical Function to be TRUE: either 
input (1) OR input (2) (or both) must be TRUE.  This is Positive Logic.

 

Truth Table-> A & B are the Input switches C is the Output LED



OR TT

Using the Same Function --It is also correct to say: In order for the Output to be FALSE: input (1) AND input (2) must both be FALSE. This is Negative Logic.
Remember: 
1) A Positive AND gate is a Negative OR gate 
2) A Positive OR gate is a Negative AND gate

logic element symbolIn order for the Output of an XOR Logical Function to be TRUE: input (1) & input (2) must both Different  01, 10.  This is Positive Logic.

 

Truth Table-> A & B are the Input switches C is the Output LED

Using the Same Function --It is also correct to say: In order for the Output to be FALSE: input (1) & input (2) must both be Identical  11, 00. This is Negative Logic.

Truth Table-> A & B are the Input switches
C is the Output LED

 

 

flip flop Set Reset Mode

 Toggle Mode

Data Mode

  

Decimal number generation using Binary

decimal using binary

Binary-Decimal-Real Values

Binary Codes

Number Decimal fraction Two's  complement One's complement Sign + magnitude Offset binary +7 +6 +5 +4 +3 +2 +1 +7/8 +6/8 +5/8 +4/8 +3/8 +2/8 +1/8 0111 0110 0101 0100 0011 0010 0001 0111 0110 0101 0100 0011 0010 0001 0111 0110 0101 0100 0011 0010 0001 1111 1110 1101 1100 1011 1010 1001 0 0 0+ 0- 0000 0000) 0000 1111 0000 1000 1000 1000) -1 -2 -3 -4 -5 -6 -7 -8 -1/8 -2/8 -3/8 -4/8 -5/8 -6/8 -7/8 -8/8 1111 1110 1101 1100 1011 1010 1001 1000) 1110 1101 1100 1011 1010 1001 1000 1001 1010 1011 1100 1101 1110 1111 0111 0110 0101 0100 0011 0010 0001 0000)