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In assembly language programming, particularly for the 8086 microprocessor, writing a program to calculate the sum and difference of two values stored in memory involves understanding the architecture of the 8086, including registers, memory addressing, and instruction set. The 8086 is a 16-bit microprocessor with a segmented memory architecture and provides general-purpose registers such as AX, BX, CX, DX, SI, DI, BP, and SP that are used for computation and memory manipulation. It also has segment registers CS, DS, ES, and SS, which are used to access different memory segments. To begin with, the first step in the program is to define the data segment. In the data segment, we declare two memory locations to store the values whose sum and difference we intend to calculate. For example, the memory locations can be labeled as `NUM1` and `NUM2`. Additionally, we also allocate memory to store the results of the sum and difference, which can be labeled as `SUM` and `DIFF`. The data segment may look like this: ``` DATA SEGMENT NUM1 DB 15H ______ _____ _____ ___ __________ ________.
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