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Z80-Emu/calculator.rom

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3E 05 ; LD A, 5 ; Load 5 into register A
06 03 ; LD B, 3 ; Load 3 into register B
80 ; ADD A, B ; Add A + B (A = A + B)
90 ; SUB A, B ; Subtract B from A (A = A - B)
C9 ; RET ; Return (end the program)