First post at the forum and I am glad that I managed finally to register (not without the problems
).I recently picked up an Atari Mega ST2. It’s specifically a Behring Nephelometer 100 Terminal, though that likely doesn't matter regarding the issue at hand.
I bought the unit with an SM124 monitor, and everything works perfectly in ST High resolution. When I inspected it before buying, it was connected to an SC1224, and everything ran flawlessly then, too. After bringing it home however, it turned out the machine has trouble with SCART monitors/TVs. The symptom is a lack of synchronization. The computer does boot up - you can see the GEM background in ST Low mode if you look closely at the second photo (click to enlarge).
- IMG-20261003-153304191-HDR.jpg (49.55 KiB) Viewed 8 times
- IMG-20261003-153334444-HDR.jpg (60.1 KiB) Viewed 8 times
When I launch something in lower resolutions, the background pattern changes, so the computer is definitely working; it just can't seem to establish a proper sync signal. I also have a STE machine that works without any issues using the same DIN13-to-SCART cable and the same monitor. I even bought a second cable, but got the same result. I also tested it on a different SCART TV with the same outcome (no picture here).
I am not sure if it helps, but here are the photos of mobo after removing UART Megabus card.
- IMG-20261004-123031263-HDR.jpg (535.67 KiB) Viewed 6 times
- IMG-20261004-123015611-HDR.jpg (384.81 KiB) Viewed 6 times
What can I do or check besides buying an SC1224?
PS. I will be coming to CL5 and planning to bring it in, so maybe someone could have a look at it there?
