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I orderded the 1nf, but I am going to get a 100pf as well. Just to be sure.

Well the weird thing is: it worked fine before the whole stereo debacle... But you got a point. I'll keep ya'll updated!

Crap, just missed this. You think the 1nf will work as well? I got it from: http://atari8.co.uk/wp-content/uploads/2016/12/Ultimate-1MB-and-Incognito-BIOS-and-XEX-Loader.pdf(page 7)

I just read the topic, and also the PDF for updates at http://atari8.co.ukand it said 1nf ceramic capacitor. Just put the order in for a bunch of those. Gonna do the fix as soon as I get them in!

I will thanks again!

Thanks! Do you have a link to his solution?

It's a pretty new U1MB, but I think somethings up because it won't save the config in the menu...

Fuckin hell. I reseated the rom in the U1MB, took out and put in the battery, mounted the U1MB in again and now it works! I need to do the rest (stereo) and test it more thorough but it seems like that fixed it!

I dismounted the U1MB and got an mmu and rom from a 600xl and the 800xl works. So it is the U1MB. Fuck.

None of the bottom chips are the culprit. Gotta be something else.

It's not the CPU or the GTIA. I have tested them in another 800xl board and it works. So it's gotta be something else. Maybe the U1MB or even the Pokey(s)? EDIT: Also not the Pokey.

I tried a spare GTIA and the problem persists. So I am going to try a spare CPU. Downside: because of the U1MB, I need to solder 4 wires to it. :'(

Here is a video, mainly listen. https://youtu.be/kZm5R86xkMg I tried taking out the stereo board and just putting the pokey in, but same result. As you can see it also has a U1mb and I reflashed the rom and that also didnt work.

I've used this manual: http://lotharek.pl/zasoby/produkty/45/pliki/simple_stereo.pdf And I double checked the pin connections, I got the right ones. I will make a video of the ramping today and some pictures of the board (hint: wire mess)

Hello! I have this really weird problem with my Atari 800xl. After just finished building in, and testing my stereo upgrade next to my u1mb, I did something stupid. Well, I saw my mistake after the first black screen but I can't for the life of my understand why the problem persists. So, what happened? Well this: for the stereo upgrade you need to add a wire for the pin 15 on the GTIA chip and pin 13 on the cpu, Did that, tested it opened up, worked so yippeee right? I wasn't thinking 100% straight and put the shielding on, screwed the atari together and turned it on. Black screen. Fuck!!! I forgot to tape off the exposed wire @ the gtia and cpu and so they probably came in contact with the shielding and you can guess the rest... So now I get a black screen, and after a couple of seconds a low sound starts, and ramps up in tone in around 7 seconds and then ramps down again... It's not ramping up in volume, but ramping up in frequency. So it starts at C#1 or something and ends up at C#4, but not all the way up. Does anybody have an idea whats goin on? I tried disconnecting the stereoboard and just seat the pokey but no cigar. Maybe a fried CPU or GTIA? I am not a hardware specialist but this wasn't my proudest moment... :'(

Hello fellow atarians! I have a problem with my atari STe. As the title says when I turn it on it gets a weird screen like so: Here are the specs and what I've done so far: - Atari 1040STe, 4mb memory, hxc floppy emulator - Strange rev board: - No visual damage to the board/components - 4 mb memory upgrade (tried multiple different simm's in different combinations and tried these on a other ste & worked) - Replaced shifter chip (facebook ste group came up with that one, didn't work unfortunatly) - Pushed all the chips in their sockets - Also tried working floppy drive with floppies. - Hold the reset button for 10 seconds when turning on. - Video: 13pin din to composite cable - Video: RF via TV - Video: 13pin din to scart - All gave the same result, see this short video: https://vid.me/e/UxCW - Pressing keys on the keyboard give the typical beep sound so sound works I guess? - Hxc floppy emulator works great on other atari's, on this one it doesn't seem to load much. See this short video (beep = st cold reset): https://vid.me/e/dojE - Tried a different, known working, PSU still same result. - TOS roms are soldered (so no socket's damnit, I have 2.06 roms laying here though but too scared to solder and fecking the board up) Even after all that, I can't figure out what's wrong. I have ordered a HI-res din to vga cable to test out if the ste is maybe stuck in HI-res mode or something. (read it somewhere, can't remember). Warning, I don't have much hardware knowledge (so pls not too much jargon) and I don't have precise soldering skills and money ( ) Is there anyone here who might have any idea what it might be?