correct aspect ratio? \ VOGONS

correct aspect ratio?

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First post, by pengton

Posted on 2015-09-06, 19:22

pengton Offline

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Hi, tepples says that Mode X (320x240) + VGA mode 12h (640x480) has a 39:40 pixel aspect ratio. Meaning final image drawn to screen is adjusted by width * 39/40 - tiny bit thinner.

https://pineight.com/mw/index.php?title=Dot_clock_rates
http://forums.nesdev.com/viewtopic.php?p=154675#p154675

Always thought 1:1 PAR => 4:3 DAR so mentioning this finding. ^^

Reply 1 of 2, by Tertz

Posted on 2015-09-06, 21:58

Tertz Offline

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pengton
As common aspect of a CGA-SVGA CRT monitor was 4:3, hence if a video mode has 4:3 quantity of pixels - there is nothing to adjust, pixels are ordinary squares.

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Reply 2 of 2, by pengton

Posted on 2015-09-07, 00:19

pengton Offline

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Joined: 2015-09-06, 19:14

Ah, okay. Thank you.

Also found this useful reference
https://en.wikipedia.org/wiki/List_of_common_resolutions

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