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ECE150_2008FALL_EXAM1__[0] - ECE 150 Digital Logic Design...

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ECE 150 – Digital Logic Design Fall 2008 Test #1 Name: ________________________________________ Email: ________________________________________ Write all of your answers directly in this test booklet. Use the backs of pages if necessary. You do not have to show your work unless otherwise stated. Feel free to use scrap paper, but do not hand it in. Please also write your name on the top of each page.
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Question 1: Number Bases For all parts of this question, assume that we are dealing with a computer that stores signed integers in 8-bit registers, using 2's complement for negative numbers. (a) Convert the decimal number 85 to binary. (b) Convert the decimal number -85 to binary. (c) What is the result when binary 01011010 is added to binary 11101111? Express the result in both binary and decimal. (d) What decimal number does the hexadecimal pattern AB represent?
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Questions 2: Logic Gates and Combinational Logic (a) Draw the distinctive shape standard logic symbols for the exclusive-or (XOR) gate, and show a truth table for the gate.
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