D9 to Scart Cable?

[lettuce]

I am going to be making a D9 to Scart (UK) cable, and am just wondering what sync wires i need and what ground is best to use. I understand that a 5 or 6 core wire is enough wire to use....



Now i believe the pinout on the Scart are:


Pin 15------Red
Pin 11------Green
Pin 7-------Blue
Pin 19------V Sync
Pin 20------H Sync
Pin 16------RGB control
Pin 18------Ground

But what im not sure on is what sync i need, either pin 19 or 20?, also is Pin 18 the best pin to use for ground or is there another pin that creates a better ground as there are a number of ground pins in the scart plug and finally is pin 16 needed??

[Fudoh]

What's your output ?

Scart only has one (composite) sync pin (that's 20 for male scart connectors). Put the GND to pin 17 and connect 17 to 4 and 18.

If you need switching voltages to Pin 8 or 16, you require a +5V source.

[lettuce]

What's your output ?

Scart only has one (composite) sync pin (that's 20 for male scart connectors). Put the GND to pin 17 and connect 17 to 4 and 18.

If you need switching voltages to Pin 8 or 16, you require a +5V source.

Well it will be going from the D9 socket on my Hantarex to a Scart Switch (with phone audio sockets) for retro console use. This is the D9 Pinout



Is Switch voltages mainly for TV's so when you fire up the device using the scart cable it switches the TV over to the scart channel automatically?

[Fudoh]

So, it's Scart to D9 cable and not a D9 to Scart cable (with the Hantarex offering an input, not an output, right?) - - that's something completely different, as Scart cables are not bi-directional.

You have to use Pin 19 for composite sync on the Scart end. From there you would go to Pin 8 of the D9 connector, but that will only work if the Hantarex a) accepts analogue RGB instead of TTL and b) accepts composite sync and doesn't require seperate sync signals.

[lettuce]

So, it's Scart to D9 cable and not a D9 to Scart cable (with the Hantarex offering an input, not an output, right?) - - that's something completely different, as Scart cables are not bi-directional.

Yeah im using the Hantarex to play the consoles on.

You have to use Pin 19 for composite sync on the Scart end. From there you would go to Pin 8 of the D9 connector, but that will only work if the Hantarex a) accepts analogue RGB instead of TTL and b) accepts composite sync and doesn't require seperate sync signals.

So if it doesnt i need to connect it to pin 9 on the D9 connector?

Any ideas what Pin 6 is, Intensifier??

[Fudoh]

Your Hantarex MIGHT need Pin 9, but Scart can't provide it.

Pin 6 is part of the digital TTL RGB signal.

[lettuce]

Pin 6 is part of the digital TTL RGB signal.

So i dont need to worry about that?

[lettuce]

Pin 6 is part of the digital TTL RGB signal.

What does this exactly do?, is it sync related?, is there a pin on the Scart I can connect it to?.

I thought pin 20 on the Scart was h sync??, shouldnt this be connected to pin 9 on the D9

[Fudoh]

On analogue RGB setups (like everything we discuss here on the board) you don't need it. It's for Digital (TTL = Transistor Logic to Transistor Logic) RGB signals. Some CGA workstations (as in 4-color CGA) in the 80s used this.

Scart only has ONE sync pin (composite sync/video). That's pin 20 for anything TO male Scart and pin 19 for male Scart TO anything.

Are you sure you want to try this on your own ??

[lettuce]

Yeah thanks, its not hard to solder some pins to a few wires, just wanted to make sure what pins are needed

[Fudoh]

Let us know how it works out. The spec sheet above says TTL + seperate only, so you must get lucky to get a simple RGBs connection to work.

[lettuce]

Will do

[Fudoh]

Also remember - if you don't get a picture right away - that clean sync might be required, even if composite sync is supported. So you might want to chose a source that can provide that for the initial testings.

[viletim]

lettuce,

Your pin listing says it's an RGBI TTL input... That's four bit digital video from old computers such as the Commodore 128, IBM PC (CGA), etc. It's not compatible with SCART/analog RGB.

If you're in any doubt, you can measure the resistance between a colour input and ground with a multimeter. If you measure something around 75 ohms it is an analog video input.

[lettuce]

Its appears to have a switch on the back to select between RGBI TTL input and Analog

[lettuce]

Ok, all my parts for make this cable have turned up now. And this is how ill be wiring it up...



I'll be using Pin 20 for sync as its a male scart socket im using!....when is pin 19 needed??

[Fudoh]

when is pin 19 needed??

when you're coming from a FEMALE output (e.g. an output socket on a switch or a Scart socket on a DVD player).

[lettuce]

Well cable is constructed now!!....





One thing though i needed to use PIN 19 for sunc, as PIN 20 didnt work!?

[Fudoh]

just as stated above: if you use a FEMALE output, you have to use Pin 19.

Your cable has a male input, so you're using a female output - bingo!

[lettuce]

just as stated above: if you use a FEMALE output, you have to use Pin 19.

Your cable has a male input, so you're using a female output - bingo!

Ah when i read male scart i just thought of a normal scart plug with the pins, and female being the opposite.

So for a male scart (with pins) you always use PIN 19, but if working with a female scart socket you use PIN 20?

[Fudoh]

no, sorry.

The rule reads like this: MALE output is Pin 20. And everytime to change direction OR gender, you switch between Pin 19 and Pin 20. Same goes for audio.

So, female output: 19, female input: 20, male output: 20, male input: 19.

[Fudoh]

And how's the result ? What a snapshot of the actual monitor running with the cable ?

[lettuce]

no, sorry.

The rule reads like this: MALE output is Pin 20. And everytime to change direction OR gender, you switch between Pin 19 and Pin 20. Same goes for audio.

So, female output: 19, female input: 20, male output: 20, male input: 19.

How does that work then, taking the following picture, the one on the left is from my XRGB Mini (UK) female scart cable and the one on the right is the cable i built today with a male (pins) scart plug....



In this case if i plugged these 2 scarts together the sync on the male scart (right picture) would be connected to the ground pin on the female scart (left picture)??

And how's the result ? What a snapshot of the actual monitor running with the cable ?

Yeah seem fine, ill take some pics tomorrow and post em up.

Regarding the 7 core cable i used, i was hacking up an old scart to scart cable today and noticed it had like a tin foil wrapping around the inside wires, i guess this is shielding of sorts??, my wire 7 core cable i bought doesn't have any such tin foil wrap...would this effect anything like interference??

[Fudoh]

In this case if i plugged these 2 scarts together the sync on the male scart (right picture) would be connected to the ground pin on the female scart (left picture)??

no, it wouldn't - where do you see this ? Pin 20 is the in the lower left corner in the left picture and in the lower right corner in the right picture - a perfect match - Sync on Sync.

On your Mini adapter Pin 19 (top row, left) is wired to ground. That's wrong (has to be Pin 17 instead), but since Pin 19 is unused in all scart cables, it just doesn't matter. It can cause problems though in your scart cable only has ground on Pin 17 (might happen).

[Fudoh]

my wire 7 core cable i bought doesn't have any such tin foil wrap...would this effect anything like interference??

best thing is to use multi-coax cables in which the RGB lines have their own shielding, but with a low cable length (as yours) it's usually no problem. A system very sensitive to interference is the SNES and if the cores are too thin you might notive a hum in the audio when the video levels peak (on white pictures).

[MKL]

On your Mini adapter Pin 19 (top row, left) is wired to ground. That's wrong

That's pin 21 (outer shield), correctly wired to ground.

[lettuce]

In this case if i plugged these 2 scarts together the sync on the male scart (right picture) would be connected to the ground pin on the female scart (left picture)??

no, it wouldn't - where do you see this ? Pin 20 is the in the lower left corner in the left picture and in the lower right corner in the right picture - a perfect match - Sync on Sync.

On your Mini adapter Pin 19 (top row, left) is wired to ground. That's wrong (has to be Pin 17 instead), but since Pin 19 is unused in all scart cables, it just doesn't matter. It can cause problems though in your scart cable only has ground on Pin 17 (might happen).

Remember that right picture is before i found out that PIN 20 didnt work for sync, so i had to use pin 19, hence why i put a red X over the yellow PIN 20 wire, so in this case if i plugged these 2 scarts together the sync on the male scart (right picture) would be connected to the ground pin on the female scart (left picture) as stated. Or though you say he Mini adapter is wired incorrectly and the ground pin 19 wire should be pin 17 instead in which case if it was wired correctly neither of the syncs on the 2 cables would be connected to anything as 1 uses PIN 19 (right picture) and the other uses PIN 20 (left picture) for sync?

my wire 7 core cable i bought doesn't have any such tin foil wrap...would this effect anything like interference??

best thing is to use multi-coax cables in which the RGB lines have their own shielding, but with a low cable length (as yours) it's usually no problem. A system very sensitive to interference is the SNES and if the cores are too thin you might notive a hum in the audio when the video levels peak (on white pictures).

The wire cores on the cable I used was probably about twice a thick as those found inside the Mini Adapter cable.

When does a Cable start becoming too long and cause interference,?, over a meter?

[Fudoh]

Remember that right picture is before i found out that PIN 20 didnt work for sync

oh boy - come on! It's not this hard. When you PLUG a MALE Scart connector into the Mini adaoter, you assume that the cable direction is INTO the Scart connector.

You're using your cable the other way around. FROM Scart to Din9. That's why *YOU* have to use Pin 19, but if you CONNECT any Scart connector INTO the MiniDin adapter, it has to use Pin 20.

Or though you say he Mini adapter is wired incorrectly

sync is wired correctly. Just one of the grounds is on the wrong pin, which is usually no problem, but could cause a problem with certain RGB cables.

In this case if i plugged these 2 scarts together

but you don't - wrong cable direction..... Any cable involving ONE Scart connector is ONE-WAY only.