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# CH2 (2) - Rick Wagoner IET645 Spring 2006 Chapter 2...

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Rick Wagoner IET645 – Spring 2006 Chapter 2 Exercises E2-3. Write assembler directives to reserve 100 bytes from \$D000 to \$D063 and initialize them to 0. ORG \$D000 ; Define initial location for memory reservation MEM BSZ 100 ; Reserve 100 blocks of memory and initialize to 0 E2-6. Write a program to compute the sum of \$DA03 and \$934A and save the result at \$00 and \$01. ORG \$C000 ; Initialize location to begin storing instructions LDD #\$DA03 ; Load initial value in double accumulator D ADDA #\$934A ; Add second value to double accumulator D STD \$00 ; Store double accumulator D to \$00 and \$01 END E2-11. Find the values of accumulator A and B after the execution of the MUL instruction if they originally contain the values a. \$33 and \$80, respectively \$33 x \$80 \$1980 so accumulator A = \$19 and accumulator B = \$80. b. \$7C and &55, respectively \$7C x \$55 \$292C so accumulator A = \$29 and accumulator B = \$2C E2-12. Which of the conditional branch instructions in the following list will cause the branch to be taken if the condition flags N = C = 1 and Z = V = 0. a. BCC target if C = 0 branch will not occur b. BNE target if Z = 0 branch will occur

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