[Atari TT] Width column row isn't constant

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sappas
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Joined: Mon May 25, 2020 9:10 am

[Atari TT] Width column row isn't constant

Post by 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
Atari TT column row width issue
Atari TT column row width issue
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stephen_usher
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Re: [Atari TT] Width column row isn't constant

Post by 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.
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sappas
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Joined: Mon May 25, 2020 9:10 am

Re: [Atari TT] Width column row isn't constant

Post by sappas »

I've to take a better photography, and with compression artefact but on my falcon, it's perfect !
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stephen_usher
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Re: [Atari TT] Width column row isn't constant

Post by stephen_usher »

The Falcon outputs standard VGA timed signals, the TT doesn’t. They are outside the acceptable range for standard VGa.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
sappas
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Joined: Mon May 25, 2020 9:10 am

Re: [Atari TT] Width column row isn't constant

Post by sappas »

stephen_usher wrote: Mon May 25, 2020 10:58 pm 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.
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rubber_jonnie
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Re: [Atari TT] Width column row isn't constant

Post by 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.
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