NTSC display questions

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doctorwho8
 
Posts: 155
Joined: Sat Aug 01, 2009 10:24 pm

NTSC display questions

Post by doctorwho8 »

Hello!
I bought from Micro Center a while back this guy, [url]https://www.adafruit.com/product/946/url] and I've also managed to work out how to export composite video from a Pi Zero, it involved installing a header on the open points marked TV. Now I have it displaying text on the rig. Of course the big question involved is in shrinking the text so that it is properly shown.
I enabled things here:

Code: Select all

# uncomment for composite 
sdtv_mode=1
I then set things here:

Code: Select all

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
overscan_left=42
overscan_right=42
overscan_top=84
overscan_bottom=84

# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=320
framebuffer_height=240
It seems that no matter how much I increase the top and bottom numbers, I can't shrink the screen to match the size of display. As always I am deferring to the people at Adafruit who possibly tried out the display when it was first available.

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adafruit_support_mike
 
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Joined: Thu Feb 11, 2010 2:51 pm

Re: NTSC display questions

Post by adafruit_support_mike »

The display's resolution is 480 x 272. Try using that instead of the 320 x 240 listed above.

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doctorwho8
 
Posts: 155
Joined: Sat Aug 01, 2009 10:24 pm

Re: NTSC display questions

Post by doctorwho8 »

adafruit_support_mike wrote: Sat May 06, 2023 3:41 am The display's resolution is 480 x 272. Try using that instead of the 320 x 240 listed above.
Hello!
That looks better. Now I need to work on the overscan settings. What would be good settings for the top and bottom entries?

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adafruit_support_mike
 
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Re: NTSC display questions

Post by adafruit_support_mike »

It varies from one display to another. You'll have to work it out by trial and error.

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surganova
 
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Joined: Wed Jun 14, 2023 10:42 am

Re: NTSC display questions

Post by surganova »

Hi, item 913 (https://www.adafruit.com/product/913).
Question: if there is no signal, what is on the screen? "Snow", or blue screen like on most of the displays? Thanks.

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