Hi Guys,

Well, I'm finally finished trouble shooting these boards. Found 4 problems in total... all my fault for not being more careful in soldering and younger! or at least having very good eye sight.

Problems #1 and 2 on Board A were solder shorts, see below.
#3 was a pin lifted for an early mod ...

I've got my Arduino 6502 tester working reasonably well. It's testing about 90% of the 6502 functionality. However, the C74-6502 is showing some quirks that don't match the 6502 processor. It's hard to nail down and/or describe. I am not pulling out the logic analyzer yet, I'm trying to just get ...

Like all things, you can't fix something without the right tools!
I needed something that will exercise a 6502 CPU, so I figured I would put an Arduino Mega on the job.
On my bench, you will see a 6502 plugged in to the top of the Arduino.
I am clocking the chip by using I/O commands and observing ...

Hi,

My first post here.

I am new here.

Building a discrete logic 6502 CPU, a design by Drass.
So far, only the soldering iron is smoking... so not sure if it's going to work first go around.
Fortunately, I am very lucky to have Roberto near by to get this running, I am certain to need his help ...