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Asked: 2026-05-29T18:13:42+00:00

I have written some simple and working assembly code on 8085 trainer hardware. But

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I have written some simple and working assembly code on 8085 trainer hardware.
But I am unable to check my result for my first program, on GNUSim8085.
I just load 2 numbers, add them and store the result in memory.
Take a look at code, registers and memory below (after successful execution of program)
enter image description here
Before executing code I had put ’11’ in location 1000 and ’78’ in location 1001.
so after execution location 1002 should have ’89’, but it is 0(as visible in image)
Also when i tried stepping through, registers A and B never changed.

What am I doing wrong?

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1 Answer

  1. Editorial Team

    The memory address you are reading and modifying is in decimal. Whereas in your code you entered address as 1000h and 1001h.

    Either convert 1000 to hexadecimal i.e 03E8h or change your code i.e. 1000 (drop h).
    Or change the locations where you are writing the numbers to be added.

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