Composite video signal inside of Falcon?

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simonsunnyboy
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Composite video signal inside of Falcon?

Postby simonsunnyboy » Sat May 28, 2005 8:59 am

While adding CF, I'll even have a look to add a simple composite video signal output to my Falcon as I don't want to buy an adaptor for ST monitors ;)

The question is: where can I solder a cable (and plug) for composite video? Am I right that the TV modulator takes composite video as input so that I could grab it before it enters the modulator and wire it to a seperate plug?

I'd also consider a pin att he weird 19pin video connector to put a wire there....

Any help and suggestions appreciated!
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Postby Crash » Sat May 28, 2005 10:15 am

I'm not sure if I recall, but there is definitely a place to do so since I made an ST Monitor to composite video adapter for the Falcon...

Just let me get out the multi-meter (whistle-whistle)

Okay, here's the Falcon pinouts:

MONITOR CONNECTOR (DB19 Male)

Pin Signal Pin Signal

1 Red 11 GND
2 Green 12 Composite Sync/Video
3 Blue 13 Horizontal Sync
4 Mono/Overlay 14 Vertical Sync
5 GND 15 External Clock Input
6 Red GND 16 External SYNC Enable
7 Green GND 17 +12V
8 Blue GND 18 M1
9 Audio out 19 M0
10 GND

Looking at the back of the Falcon:

01 02 03 04 05 06 07 08 09 10

-11 12 13 14 15 16 17 18 19-


Rather than soldering a cable directly to the Falcon, I might recommend that you buy a female DB19 connector and a shielded RCA connector to make the adapter out of. In any case - the composite video connection is with Pins 10 and 12. 12 goes to the center of the composite cable, while 10 goes to the outside. If you look _real_ closely in the back of the Falcon video connector, you can see the pin numbers embossed in the plastic next to each pin.

Does that help?

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Postby simonsunnyboy » Sat May 28, 2005 10:37 am

It helps a lot - thank you!

Just those DB19 connectors are so d*** nonstandard that I haven't found a single vendor for them here in Germany.

Beside I'll mod the case a bit anyway so placing my own connector won't hurt.
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Postby karlm » Sun May 29, 2005 2:50 am

ssb - if you are having problems getting a DB19 connector, you can 'bodge' one from a DB25 and just cut off 6 pins from one side. It works, but it ain't pretty ....

and as crash said, it's way better to make a cable on the outside.

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Postby simonsunnyboy » Sun May 29, 2005 7:28 am

karlm wrote:ssb - if you are having problems getting a DB19 connector, you can 'bodge' one from a DB25 and just cut off 6 pins from one side. It works, but it ain't pretty ....


I doubt that is possible - one needs the connector with holes and not the one with small contacts for the cable.


and as crash said, it's way better to make a cable on the outside.


Absolutely true after taking a look inside the Falcon! I've never seen a machine that was wrapped that much in metal shielding!
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Postby simonsunnyboy » Sun May 29, 2005 11:39 am

Ok, it works for the bodged 25Pin one :)

Now I wonder: do I need to wire some sort of monitor detect or is it ok without doing so?
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Postby simonsunnyboy » Sun May 29, 2005 2:44 pm

Never mind - I tried without and it works like a charm.

I have connected the Falcon to my TV card now via composite.
The quality is 2 times better than over the TV modulator into the card. It doesn't reach VGA of course but now I do not need to switch monitor cables but can launch a TV viewer on my desktop.
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Postby karlm » Mon May 30, 2005 12:13 am

from memory the monitor detect pins allow the falcon to decide if you have a VGA or a RGB (sc1224/sc1435) or mono (sm124/sm125/sm145) monitor. When you use a tv, it doesn't need a plug at all, uses the modulator, but I don't think it stops sending signals along the DB19 plug at all, so the composite lines keep outputting signal.

I remember somewhere that said it would be a good idea in putting something inline on the cable (diodes?) to stop stupid voltages either going to the monitor or the falcon, i think it was the monitor. This is because tvs are sheilded normally on the modulated input ( i guess to stop lightning, etc )

but the long and short of it - it will work without signals on M0/M1 as this just selects what type of monitor you have.

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Re:

Postby paul92706 » Sun Aug 18, 2019 12:45 am

simonsunnyboy wrote:Never mind - I tried without and it works like a charm.

I have connected the Falcon to my TV card now via composite.
The quality is 2 times better than over the TV modulator into the card. It doesn't reach VGA of course but now I do not need to switch monitor cables but can launch a TV viewer on my desktop.


Sorry to bring up this old thread simmon, but how did you connect the 19pin VGA port to composite cable? Did you use pin 12 and pin 10? And did you pull M1 to ground? Please explain thanks
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Re: Re:

Postby simonsunnyboy » Sun Aug 18, 2019 8:45 am

paul92706 wrote:
simonsunnyboy wrote:Never mind - I tried without and it works like a charm.

I have connected the Falcon to my TV card now via composite.
The quality is 2 times better than over the TV modulator into the card. It doesn't reach VGA of course but now I do not need to switch monitor cables but can launch a TV viewer on my desktop.


Sorry to bring up this old thread simmon, but how did you connect the 19pin VGA port to composite cable? Did you use pin 12 and pin 10? And did you pull M1 to ground? Please explain thanks


One wire to the video signal, one to the ground, no resistors or other stuffs.

By now i have the Falcon->ST RGB adapter and I just use STE SCART leads. This is almost 15 years old ;)
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