Denial

Thank you for all of the replies! I greatly appreciate it! It is a strange motivation to learn assembly, but it ignited the fire just the same. To be specific, I have a copy of some VIC 20 Diagnostic firmware that has a bug when it comes to determining how to display on the screen (I get odd colors)...

I'm new to assembly language, and I would like to learn it for the VIC-20. I have some source code that I would like to examine to see if I can find a bug(s) that is present (I didn't write the code). Before I can do that, I need to learn assembly for the VIC-20, and I need a recommendation on a goo...

Here's where I purchased mine for my VIC 20's and C64's that I have. I could tell the difference immediately from my regular composite cables I was using.

https://www.ebay.com/itm/165784501517?h ... Swa5RgAQOO

Joe

Great job!

Thank you! Very timely. Since I've repaired all of my C64's and VIC-20's, it's time to repair the cases.

Joe

That's the word I was looking for at the time! Shielding!

Joe

This tester is mentioned in another post. After visiting the associated Github site, I can't see all of the connections on the breadboard. Does anyone know the breadboard hole assignment for the corresponding wires? Some are obvious, others are not. Yes, I'm a newbie on Arduino things.

Thank you

Joe

I had a similar issue with my VIC-20 and C-64. I ordered a new cable with stronger insulation, and the issue went away. The cable for the video (yellow connector) is very thick on the new one.

Joe

I'd enjoy seeing the posts. I'm out of commission for working on computers for a while. I tore my right shoulder rotator cuff. Hopefully all I'll need is therapy, and not surgery. I'll find out in a few days.

The Arduino chip tester looks interesting.

Joe

No problem! You're not being VICious.

VICtory! I found a missing connection, installed a bodge wire, and it booted up!

Joe

I found it! When I replaced the chip and installed a socket for the 74LS245 at UF8, pin 1 apparently lost a trace to UC3 pin 2 during the process. I had a feeling it had to do with something from my previous pulling up traces problems. I connected a bodge wire from one pin to the other on the back o...

Thank you for the link! I did put the missing "o" on the "inf" portion of the link to get there. I appreciate the offer on the board, and we'll see what the future holds. I don't surrender well at all to problems. As for Denmark, I actually do have Danish blood from my mom's side...

The ROM's are fine. But I'm still working on the VICtim.

Joe

Great job! Thank you for letting me know about the scope screenshots. Let me know where I can find them when they're ready. I'm still fighting my VIC. I desoldered the CPU, tested it in the working VIC-20, and it's fine. So I installed a socket, and put it back in. So I'm tediously checking each tra...