Denial

I'm interested to hear what you discover. I have the same PCB's, but my diagnostics card is direct from a vendor. Are you in the U.S.? If so, you could send me the chip in question and I can test it in several of my VIC-20's for you. And I'll pay return postage as well. If you're in Southern Califor...

That was an interesting question as to whether the harness was needed for ROM testing. So I ran the diagnostics without the harness, and the ROM tests occur before it checks the ports (the first port checked is the serial port). For the ROM tests, you should get the following (source: http://blog.ty...

Yes, it does. To be honest, I didn't expect it to work.

I loaded a program from a tape, ran the program, inserted a blank tape, saved the program, cleared memory, loaded the program from the new tape, and ran the program. No issues.

So what does that mean?

Thank you!

Joe

I recently acquired a VIC 20 in an unknown status. After cleaning and visual inspection, I powered up the system and it boots fine. I then powered off, inserted the diagnostic cartridge and the harness components, and ran the diagnostics. The result was "Cassette Port - Bad". I checked the...

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