Denial

Yes I have a non functioning VIC20. Could be a connection issue, there are a lot of recommendations to unplug and replug the socketed chips, which is a good idea. You may have moved a chip ever so slightly during cleaning that caused a connection to be remade and correct the problem. I believe the C...

The radio hash is produced by the VIC chip, the noise is a good sign the VIC chip is working.

Regards
Herman

How can this work if the 6560 is needed?

Herman

I read a commentary on this forum where a guy commented on making a manufacturer run of the VIC chips but said the need is not great enough to payback the expense of rerunning production of the VIC chip.

Herman

Wow, that is a lot of money to ship it to Italy. Really puts it out of range of buying.

Herman

I believe you will have to buy untested vics for sale on ebay and take your chances that the VIC chip is good in what you buy. I bought the mother board, no case or power supply, and found the VIC chip was bad on the mother board I bought. You pays your money and takes your chances. At least there a...

You had some very good questions that I hope someone answers. Your posting is the first sign of real technical analysis, thank you. To bad the fix ended up in massaging for a solution, that doesn't help at all.

Regards
Herman

The VIC20 was only the case and keyboard, no mother board.

Herman

I have a bad VIC chip and need a replacement. It is the 6560 NTSC

Herman

What was the selling price?

Herman

Do you still have the two VICs?

Herman

I swapped out VIC20 A's VIC chip, the one in the metal enclosure with the VIC20 B's VIC chip. VIC20 B screen with random characters cleared up and now have a second working VIC20. The screen colors are a bit smeared even in composite mode.

So I need a VIC chip to put into VIC20 A.

Herman

I had a screen full of random characters and non functional keyboard.

I swapped out the VIC chip inside the metal enclosure and got my screen back and Basic function in the minimal system 3583 bytes.

Herman

VIC20 A Blank Black screen with minimum configuration. Using a CART is the same. .001 AC across 4700 microfarad and 100 microfarad caps. I don't have enough caps for all three VICs. Will get more later. Using composite video to TV. VIC20 B There is a checker board pattern of random characters fill t...

Mike BTW The working VIC is no longer working. I tried to fix it working in normal mode without extension card by replacing two RAM chips along with sockets. I read in another post he removed the sockets and soldered directly in and the VIC is now working. These are wicked little boxes when broken. ...