Write an MC68000 assembly language program that will add three numbers: one numb

Question

Write an MC68000 assembly language program that will add three numbers: one number in register D3, second one in memory locations specified by A4, and the third is an immediate value of 49. Store the sum in memory location specified in register A6

Include comments relating to the entire program (“global” comments)

Place the first instruction of the program at memory at address $2000. Use the ORG and END assembler directives where appropriate.

Start the simulator, load the program, initialize the PC register , and put representative addresses in A4 and A6. Also, put representative data in D3 and the memory location specified by A4,

Explanation / Answer

Assembly code to add three numbers:

ORG      $2000

MOVE   D3,D0 // Move value of first operand stored in D3 to D0

MOVE   A4,D1   // Move value of second operand stored in A4 to D1

ORG      $2100

MOVE D0, A6    // Load D0 into A6

ADD      D1, A6 // Add value stored in D1 to A6 => NUM1 + NUM2

AADI     #49, A6    // AADI is used to add immediate value

END       $2100

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