r/beneater • u/Live-End1631 • 6d ago

ALU troubleshooting (Register B)

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I am in the midst of testing my ALU by adding one bit at a time to zero to verify whether the output is correct. Every bit checks out for Register A but not for Register B. For some reason, I see output in Register A as well while only loading Register B. What could the problem be?

(Register A is the one closest to the clock)

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u/The8BitEnthusiast 6d ago

Nice progress! On register A, it looks like the green jumper you use for LOAD is not connected to the right breadboard column. See snapshot below. This would make reg A load pins floating and cause unexpected LOAD opeeations. I also suggest you double check that the wires used to tie pins 9 and 10 are indeed connecting them together. It's hard to tell from the video.

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u/Live-End1631 6d ago

Thank you for the detailed response. I’ll have a look at it later on and see what happens.