I tried a new program. I wanted to multiply 3 pairs of numbers and add the results...perfect for using the CALL and RETURN functions. But the end-result was not correct. I analyzed videos of the runs (by checking the LEDs), I also tried the three multiplications and the addition of three results in seperate programs...everything was fine. I think that the three multiplications are influencing each other...but before I step deeper into the problem I write a program which is testing the complete hardware of the system, especially the ALU, to be sure that a program error is the reason of the little problem.
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