Digital Electronics
ASCII

 is a subset of 8-bit EBCDIC
 is version II of the ASC standard
 has 128 characters including control characters
 is used only in western countries

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
1 at any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 voltage level is lower than logic 1 voltage level.
logic 0 and, -1 are represented by negative and positive voltages respectively

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