CRT, V-SYNC, 320x200 and Dosbox. \ VOGONS

CRT, V-SYNC, 320x200 and Dosbox.

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First post, by Ilya-v

Posted on 2015-01-23, 09:49

Ilya-v Offline

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Joined: 2015-01-23, 09:26

Hi, I'm a 29 y.o games from the 90's and bless all you dosbox dev's. 😀

I use the latest Taewoong build along with my LG Flatron F700B CRT in "original" fullscreen resolution mode, "none" scaler, and Aspect correction into Direct3D output.
This seems to give me perfect CRT behavior in fullscreen which has two main modes: 640x400 @ 70Hz and 640x480 @ 60Hz as confirmed by the CRT menu during games.

The question is whether in the old day there were proper v-sync in dos games?

In windows 7 when Aero is enable it appears that there is always v-sync enabled and locked to desktop refreshrate even though the CRT is in 640x400@70Hz mode and v-sync on dosbox is off.
When Aero is disabled I see tearing in dos games when V-sync in dosbox is off, its a more expected behavior than with Aero enabled.

So, anyone found the perfect settings with Taewoong Dosbox and a CRT for a 100% correct behavior?
Can anyone actually remember tearing in the old days?

Thanks.

Reply 1 of 4, by Scali

Posted on 2015-01-23, 12:09

Scali Offline

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Ilya-v wrote:
The question is whether in the old day there were proper v-sync in dos games?

A lot of games had v-sync, such as Wolf3d and Doom.
In early 3d polygon games, I think it was less common to do so. Games such as LHX Attack Chopper, Test Drive 3 and Stunts were not v-synced, if I recall correction.
2d scrolling games also often suffered from tearing. Commander Keen and Jazz Jackrabbit were some of the first games with proper smooth scrolling and v-sync.

http://scalibq.wordpress.com/just-keeping-it- … ro-programming/

Reply 2 of 4, by Ilya-v

Posted on 2015-01-23, 14:33

Ilya-v Offline

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Thank you.

I wonder if dosbox can be put in exclusive mode to bypass the effect of desktop composition in windows 7/8/8.1/10.

Reply 3 of 4, by Scali

Posted on 2015-01-23, 14:41

Scali Offline

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No, closest thing you can do is this, the FLIPEX flag: https://msdn.microsoft.com/en-us/librar ... flip_model
But it's still vsynced. It'd just be outputting frames to the desktop in a more direct way, so you get less stutter.

http://scalibq.wordpress.com/just-keeping-it- … ro-programming/

Reply 4 of 4, by Ilya-v

Posted on 2015-01-23, 14:53

Ilya-v Offline

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Hmm,

Do you think these is a way to have a 100% authentic experience with Dosbox and a CRT including v-sync?
Right now the only thing that is in the way is V-sync (if dos games actually use v-sync).

I may be wrong but if desktop composition always v-sync-ed, isn't it true even in 640x400@70Hz ?
If so, setting the V-sync to "Host" in dosbox, should be ideal because the refresh rates are already changing according to resolution.

Any thought?

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