I have the Z80MC with all 3 cards. Built this back in 2022.
It gets power from the USB cable when I connect it to my computer.
Never tried to power it with a bench supply.
When I press the #8 button, sometimes I get an 8 and sometimes a 9.
Spent a bunch of hours troubleshooting. Never figured it out.
I've been over every connection with a microscope.
It seems to have a pattern but I don't know how to troubleshoot this.
Examples:
If I do E 2888, I get 2899.
If I do E 7888, I get 7899.
Now today, I powered it up and it's working perfectly. But I'm sure that's only because I'm writing this message.
I've seen this behavior as well. It will work fine for a while. That tells me it's likely not a problem with the button itself. It would also tell me it's not a short somewhere.
It functions perfectly when I connect with TeraTerm so it's not a huge deal and I just live with it.
