Before the 8085 can add anything, both numbers have to be inside the CPU.

Load the byte at 2000H into the accumulator A, and the byte at 2001H into register B. Do not add them yet. This step is only about getting the values where the next step can use them.

The one thing: M is not a register. It is whatever HL points at right now, so reaching the next byte means moving the pointer, not naming another address.

What is being checked

• A holds the byte from 2000H
• B holds the byte from 2001H
• The program reaches HLT
• You use LXI to set up the pointer, and not LDA

A note on M

M is not a register. It is notation meaning "the memory byte that HL currently points at", so MOV A, M is a memory read, not a register copy. Setting up HL once and stepping it forward with INX H is the pattern you will use for every array in this course.