TV (composite video) - Anyone use P15 (aural subcarrier in broadcast mode)?

Cluso99

In a design I require the use of the pin for a different purpose and was wondering if anyone is using this function with composite video?

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BradC

Cluso99 said...
In a design I require the use of the pin for a different purpose and was wondering if anyone is using this function with composite video?

Absolutely. Every board I have that has a TV output is using the 4th pin for some other function. As long as it's not an output in the TV cog there is no interference anywhere else.

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Release the hounds!

ericball

This question has been asked previously: http://forums.parallax.com/showthread.php?p=810742

P15 is used for:

1. Aural subcarrier in broadcast mode.
2. Chroma for S-Video output.
3. My NTSC240H sprite driver uses all 4 pins to get brighter colors. However, the palette could be customized to only use 3 pins (or use 8 pins for 4+4 SVideo).

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Composite NTSC sprite driver: Forum
NTSC & PAL driver templates: ObEx Forum
OnePinTVText driver: ObEx Forum

Cluso99

ericball: Yes I had missed that thread. But, not many answered the question. The board I am doing is for general use plus some extras, and I want to use this pin. So this is why I am wanting to know how many use the pin for TV broadcast (or like you). As there is VGA, it could be used rewired to produce TV if necessary.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Links to other interesting threads:

· Home of the MultiBladeProps: TriBladeProp, RamBlade, TwinBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: Micros eg Altair, and Terminals eg VT100 (Index) ZiCog (Z80), MoCog (6809)
· Search the Propeller forums (via Google)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm

Phil Pilgrim (PhiPi)

I've used it before and do provide the necessary DAC resistor for it on the boards I design. But, as of June here in the 'States, analog broadcast TV is gone, so the pin's long-term utility for an audio subcarrier is virtually nil, as far as I can tell.

-Phil

hover1

Ray,

I understood the original question this morning. Just getting a chance to answer.

I the 10-12 projects I have done so far NONE have had to use this pin. I have often thought of cutting the resistor off of the demo board to use it, but so far I have not had to. It would be a shame to hack a nice Parallax board. My boards, not a second thought

Jim

Cluso99 said...
ericball: Yes I had missed that thread. But, not many answered the question. The board I am doing is for general use plus some extras, and I want to use this pin. So this is why I am wanting to know how many use the pin for TV broadcast (or like you). As there is VGA, it could be used rewired to produce TV if necessary.