hitlp wrote:
I thought of a hypothesis now: I use a bench power supply. I connect the VCC and GND poles directly on the breadboard. Is it interesting to use some kind of filter to provide cleaner source?
Have you tried/have access to another CPU chip?
I only mention this simply because a lot of folks have used the worlds worst techniques, questionable practices, and mediocre components and have had success at the most basic level similar to what you're trying to achieve.
Yes, this stuff can be picky, but you would have to have a cascade of bad equipment up and down the chain.
Simply, it shouldn't be this hard.
Even moving the CPU to a different place on the breadboard should tell you if it's the breadboard or not. And a bench power supply should be just fine, or it has to be a really bad power supply -- and what are the odds of that? If you suspect the power supply, grab a couple of batteries and try that.
Hello guys.
New in the project. There was an Atari 2600 Jr. that was not working. I took his processor, which is a UM6507. It has a very similar architecture if you are not mistaken. But the point is: it worked! It just worked!