Atari ST / TT / Falcon Resolution Timings and Frequencies

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Icky
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Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by Icky » Sun Jun 03, 2018 4:25 pm

I have been trying to find out resolutions and timings for the Atari ST / TT & Falcon so far this is what I have collated from the inter web.

I am interested to find out the horizontal and vertical frequencies for each resolution. If anyone has any details they can share I would appreciate it?

Below is a table of resolutions and depth for the 3 machines:

Depth (bits)320x200320x480320x480640x400640x480896x6081280x960
1---ST-HighVGA-2Falcon-H2TT-High
2--ST-Med-VGA-4-
4ST-Low---TT-Med / VGA-16Falcon-H16-
8-TT-Low--VGA-256--

Below is a table of resolution timings - this one is missing a few resolutions:

NameResolutionDot ClockHorizontal TimingsVertical TimingsExtra Info
ST-High640x40025.175640 664 760 800400 409 411 450-
Falcon VGA640x48031.5640 680 720 864480 488 491 521-
ST-Low320x20012.588336 384 400 200200 204 205 225Double Scan
TT-Low320x48015.175320 336 384 400480 450 450 460-
TT-High1280x9601201280 1312 1456 1712960 963 970 980-

czietz
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Re: Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by czietz » Sun Jun 03, 2018 4:37 pm

Where did you get those values? The ST-High timings are definitively wrong -- I stopped reading after that, so I don't know about the rest of them. What you quote as "ST-High" seems to be the timing of a 640x400 VGA mode instead.

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Re: Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by Petari » Sun Jun 03, 2018 4:45 pm

Of course, timing depends from is Falcon connected to VGA monitor, or to RGB monitor/TV . And in second case depends from used color encoding mode - is PAL or NTSC. So, for some resolutions there are actually 3 timings.
You should make separate tables for diverse machines.
ST med: 320x480 - what the Hell ? ST med is same res. on all machines. Your tables are mess.
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Re: Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by Icky » Sun Jun 03, 2018 6:33 pm

Petari wrote:
Sun Jun 03, 2018 4:45 pm
ST med: 320x480 - what the Hell ? ST med is same res. on all machines. Your tables are mess.
Oops - should of read before posting. Thats what happens sat in the garden enjoying a tipple.

Yes - Let me sort this out a bit and hopefully Exxos will help update the first post.

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Re: Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by exxos » Sun Jun 03, 2018 9:41 pm

Icky wrote:
Sun Jun 03, 2018 6:33 pm
Yes - Let me sort this out a bit and hopefully Exxos will help update the first post.
Sure :) just post the new table when ready and give me a shout (or any moderators can edit the post).
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Re: Atari ST / TT / Falcon Resolution Timings and Frequencies

Post by frank.lukas » Mon Jun 04, 2018 12:35 pm

All Atari TT modes are at VGA 31,5Mhz Pixel Clock except TT-High 1280x960 at 128Mhz Pixel Clock.

Mega ST with Atari Viking Graphiccard and Atari SM194 is 1280x960 at 110Mhz Pixel Clock.

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