Addition of multi-byte numbers in Z-80

Now, in this section we will see how we can use the Zilog Z-80 Microprocessor to add Multi-byte numbers.

In this example, we are using 4-byte numbers (56 2F 7A 89)₁₆ and (21 FB A9 AF)₁₆

In the memory, at first, we are storing the byte counts, and then the numbers (from least significant bytes to Most significant bytes) in different segments. So after storing the data, the memory structure will be look like this

Now, we are writing a program at location 8000H to add these two 4-byte number and store the result at location 5090H onwards.

Program

Output