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# Computer Platforms Questions - Research Paper Example

## Extract of sample Computer Platforms Questions

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c] Extend the ideas in part b) to show how a 7-segment display may be used to display Hexadecimal. [4]
BCD Inputs
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Display
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33.]
a] Apart from using Ones and Twos Complement what other methods may be utilised to represent negative numbers in binary' Include examples in your answer [4]
Apart from Ones and twos complement Sign and Modulus or Sign-Magnitude system can be used to represent negative binary numbers. In this system a bit is reserved at the left of the most significant digit to represent sign. For example
1012 = 510 (positive)

## Summary

De Morgans Theorem states that any logical binary expression remains unchanged if all variables are changed to their complements, all AND operators are changed to ORs and vice versa and complement the entire expression.
b) Express completely De Morgans Theorem using diagrams of logic gates with two inputs A and B' [5]
Author : xschmeler
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