[Atari TT] Width column row isn't constant

[sappas]

Hello,

I suspect c300868 TT video chip, my mother board is a rev A or B,
As you can see the width of column row.
Any advice ?

Thanks

Sappas

87D57667-0361-4DBE-AD53-4BC36E015885.jpeg

[stephen_usher]

Looks more like the monitor isn't able to sync with the TT's output and so you're getting moire patterns on the screen.

[sappas]

I've to take a better photography, and with compression artefact but on my falcon, it's perfect !

[stephen_usher]

The Falcon outputs standard VGA timed signals, the TT doesn’t. They are outside the acceptable range for standard VGa.

[sappas]

The Falcon outputs standard VGA timed signals, the TT doesn’t. They are outside the acceptable range for standard VGa.

Hello, You're rigth, finally between my twenty 5/4 monitor i've found a LG L1915S witch is less bad.
Thanks a lot, for indicate me the right parh.
This issue is close

[rubber_jonnie]

My MSTE shows similar problems when used with a VGA display and in Med-Res. It's quite possible to tweak the settings in the monitors control panel to improve the picture sufficiently to make it acceptable.

I was able to fine tune the horizontal size and use auto contrast to get a great picture. Happens a lot on ST's at Med-Res using VGA displays.