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quiz3_sol - CS 061 Computer Organization Quiz 3 Tuesday...

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CS 061 – Computer Organization Winter - 2012 Quiz 3 – Tuesday 10/18 solution 1. Given that the ASCII codes for 'A' through 'Z' are x41 through x5A; and the codes for 'a' through 'z' are x61 through x7A: which of the following operations would force the character stored in R0 to lower case - i.e. convert a character stored in R0 from upper case into lower case, or preserve the case if it was lower case already.(so ‘A’ would become ‘a’, and ‘a’ would remain unchanged). Note: the LC-3 stores ASCII characters in the lower ("right-hand") byte of a 16-bit word, with the upper byte set to zero. a. and R0 with x0020 b. or R0 with x0020 c. xor R0 with x0020 d. and R0 with x005F e. or R0 with x005F f. and R0 with x004F 2. Simplify the Boolean expression: a.b’.c’.d + a.b’.c.d + a.b.c’.d + a.b.c.d’ + a.b.c.d a. a.b.c + a.b.d + b.c.d b. a.c + a.b.d c. a.c + b.d + b.c d. a.d + a.b.c e. can’t be simplified 3. What is the simplified logic expression for the truth table shown here, in the form Out = f(A, B, C)?
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