@Roberto no you should measure them both with a multimeter first, on some motherboard revisions they're OK but some they're not. So I should only test with a multimeter if I actually find a positive value on the "+" pin of the capacitor and a negative value on the "-" pin. Right?

I have two Falcon 030s and both, when they are connected with the RGB cable via scart to an LCD TV (with the VGA cable I never noticed), I see that the background color changes, sometimes, from white to light blue with some interference. Yet that same cable used with any other Atari I have, works fi...

Comparing to my own MSTE with a different diag cart, immediately after that screen I get the screen flickering and flashing and it drops me down to the menu. So you're definitely getting the first part of the diag cart startup. I have had diag cart failures as a result of bad/dirty edge connectors ...

rubber_jonnie wrote: ↑Wed Oct 11, 2023 11:12 pm Given your other post, I would suggest checking out the diag cart on another machine if you can.

I checked on two other machines: an Atari ST and a Stacy. the diag card works regularly and has no problems. Instead in my Mega STE I get a "Checking Bus error handling" when turned on.

Hi everyone, these days I haven't had much time to dedicate myself to the tests you suggested. Also because I have to understand on which chip and in which pins to perform the vsync test. However today I managed to get my diagnostic cartridge working. Inserting the cartridge and turning on my Mega S...

Hi guys, today I had time to dedicate myself to my diagnostic cartridge.
Finally, by going over the pins of the Atari type selection bridges with the soldering iron, it worked. They seemed firm and right, but instead some of them didn't make contact correctly. Thanks for the suggestions.

I have a DIAG-CART 2021 Rev 9C cartridge that doesn't work. I've used it before, so I know how to set the jumpers to adapt it to various Atari models. What I get is a black screen or it is bypassed by the system, that is, I get the desktop as if it were not inserted. No writing or menu not even via ...

If you have a scope then you should be able to check if it's stuck in mono mode by measuring the vsync. 50 or 60 Hz for colour, over 70 for mono. A little less invasive than cutting tracks. BW Thanks for these directions. I think it's time to print some wiring diagrams relating to the operation of ...

Hi everyone, I was finally thinking of re-solding the connector on the back of my Atari SC 1224 color monitor (since I can't see the image anymore), when I said to myself: maybe it's better to try it on another Atari.. The monitor works great, so it's my Mega STE that doesn't work properly when conn...

I'm offering a part exchange for those boards currently. So if you buy the simm adapter board I will discount the board you had from the total. These are better since you can simply swap the simm if the problem happens again. https://www.exxosforum.co.uk/atari/store2/#0086 Thank you! I am writing t...