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CRT Safe Area / Overscan?

Posted: Mon Aug 01, 2022 1:02 am
by AmateurSegaDev
What's the general accepted "Safe Area" for important game elements when viewing a game on a CRT? I can test against my own CRT (a sample size of one is never ideal), but I would like to know general conventions.

I looked through this thread, and didn't really see a consensus, though I certainly may have missed it:
viewtopic.php?f=22&t=237&start=90

I thought I read somewhere it was in one of the Sega Technical Documents, but I didn't see it there either.

Re: CRT Safe Area / Overscan?

Posted: Mon Aug 01, 2022 5:34 am
by cero
It varies, no consensus. Nintendo guidelines from late NES era were two tiles at top and bottom and one tile at left and right.

Re: CRT Safe Area / Overscan?

Posted: Tue Aug 02, 2022 4:11 am
by AmateurSegaDev
Hmm, okay. I guess I'll just roughly follow something like that or eyeball it compared to other games. Thanks for the reply!

Re: CRT Safe Area / Overscan?

Posted: Sun Aug 07, 2022 6:38 pm
by Chilly Willy
According to the official software standards Sega published with the devkit, you are not to put important info like the score, text, or time in the top or bottom tile rows, and not within the first two or last two tiles of a row.

Re: CRT Safe Area / Overscan?

Posted: Tue Aug 09, 2022 1:05 am
by AmateurSegaDev
Perfect. If that's what Sega recommended, good enough for me.

Thank you Chilly Willy!

I am in constant awe of your knowledge and mastery of the system, it's truly an honor to receive a response from you. :D

Re: CRT Safe Area / Overscan?

Posted: Tue Aug 09, 2022 9:41 pm
by Chilly Willy
That one I had to look up. I remembered reading it, but not the exact boundaries. Sega did the same thing with the Master System, but it was a bit more restricted as TVs of the time had larger overscan areas due to wildly differing specs of TVs at the time. A Trinitron might show virtually the entire screen, but not an old RCA.