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Conversion of unsigned numbers between number bases: In the following
table, all numbers in the same column should have the same base, while all
numbers in the same row should have the same value, fill in the blanks.
The first row is an example.
(0.2 points per blank.)
Base 2 Base 8 Base 10 Base 16
110010101101 6255 3245 CAD
101100 ______ ______ ______
________ 321 ______ ______
________ ______ 321 ______
________ ______ ______ 321
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Two's complement numbers: Each column in the following table should contain
a decimal value above it's 6-bit two's complement representation. Fill in the
blanks. The first column is an example. (0.4 per blank):
Decimal -21 25 -6 ______ ______
Binary 101011 ________ ________ 011100 111001
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Assembly operations: Show the result of assembling the following
SMAL code fragment into memory. Show your results as consecutive
32 bit words expressed in hexadecimal, showing unknown values as ?
Recall that ASCII 'A' is 41 (hex).
(3 points)
Location Value
X = 1
. = #100 _________________ _________________
B X
B Y _________________ _________________
Z: H X+Y
W Z _________________ _________________
Y = X+1
ASCII 'ABCD'
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Hawk instruction format: Show the result of assembling the following
Hawk code fragment into memory, assuming the initial value of the location
counter is 0. Show your results as consecutive 16 bit halfwords expressed in
hex. (2 points)
Location Value
LEA R5,R2,#0123
loop: LOADS R6,R5 ________ ___________________
EXTH R7,R6,R5
BZS exit ________ ___________________
ADDSI R5,2
BR loop ________ ___________________
exit:
________ ___________________
________ ___________________
________ ___________________
________ ___________________
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Hawk Programming: Write a sequence of Hawk assembly instructions
to bridge the gap between the following precondition and postcondition.
(3 points)
; Precondition: R3 points to a record in memory.
; The constant X is the offset of a field in that record.
; Field X is an array of 20 words, indexed from 0 up.
; R4 holds an integer.
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; Postcondition: R5 holds R3->X[R4] (R3^.X[R4] in Pascal).