Building a G7400 RGB cable

[rhcocker]

So I completed the G7400 RGB addition mod as described here. It was surprisingly simple and took me about an hour to finish.

 

I now need to build the 8 pin DIN to SCART cable. I am not familiar with building these, but I can't imagine it would be too difficult. So I hope someone here could give me some tips to help me complete it.

 

Here is DIN Connector Pinout (according to the website at the link above)

 

1: RGB status (75 Ohm, 3 V)

2: Ground (0 V)

3: Blue (75 Ohm, 0.7 Vtt)

4: Composite Video (CVBS) (75 Ohm, 1 Vtt)

5: Red (75 Ohm, 0.7 Vtt)

6: Status CVBS (VCR) (10 kOhm, 12 V)

7: Sound

8: Green (75 Ohm, 0.7 Vtt)

 

 

Here are my questions:

 

1) Do I add a 10 kOhm resistor to scart pin 6 and 75 Ohm resistors to scart pins 1, 3, 4, 5, and 8?

2) Does the symbol on scart pin17 (see fig) mean that I just connect it to the metal connector (pin 21)?

3) Are there any other components that I should be adding to the cable?

 

Any help or additional info would be greatly appreciated.

 

Thanks

Edited May 21, 2016 by rhcocker

[rhcocker]

Bump - Anybody?

[VPB---]

Hi!

I never add any resistor or component in the scart cable

The genuine RGB scart cable (french péritel) hasn't component inside.

[Atari 2600 H.E.R.O]

So I completed the G7400 RGB addition mod as described here. It was surprisingly simple and took me about an hour to finish.

 

I now need to build the 8 pin DIN to SCART cable. I am not familiar with building these, but I can't imagine it would be too difficult. So I hope someone here could give me some tips to help me complete it.

 

Here is DIN Connector Pinout (according to the website at the link above)

 

1: RGB status (75 Ohm, 3 V)

2: Ground (0 V)

3: Blue (75 Ohm, 0.7 Vtt)

4: Composite Video (CVBS) (75 Ohm, 1 Vtt)

5: Red (75 Ohm, 0.7 Vtt)

6: Status CVBS (VCR) (10 kOhm, 12 V)

7: Sound

8: Green (75 Ohm, 0.7 Vtt)

 

DINPinout.jpg

 

Here are my questions:

 

1) Do I add a 10 kOhm resistor to scart pin 6 and 75 Ohm resistors to scart pins 1, 3, 4, 5, and 8?

2) Does the symbol on scart pin17 (see fig) mean that I just connect it to the metal connector (pin 21)?

3) Are there any other components that I should be adding to the cable?

 

Any help or additional info would be greatly appreciated.

 

Thanks

 

Sir,

 

Don't Add Resistor and, No Other Wiring/Connections.

 

 

 

 

Here G7400 == G7200 (Only, In RGB To Scart Cable!)

3V/75Ohm, 12V/10kOhm, ... Are The Lines Technical/Electrical Specifications (Voltage/Impedance

Specification).

 

Good Luck.

Edited June 3, 2016 by Atari 2600 H.E.R.O

[rhcocker]

Hi!

I never add any resistor or component in the scart cable

The genuine RGB scart cable (french péritel) hasn't component inside.

 

 

 

Sir,

 

Don't Add Resistor and, No Other Wiring/Connections.

 

Here G7400 == G7200 (Only, In RGB To Scart Cable!)

3V/75Ohm, 12V/10kOhm, ... Are The Lines Technical/Electrical Specifications (Voltage/Impedance

Specification).

 

Thank you both very much for your replies. This helps.

[SSG]

I couldn't help ya. SCART isn't common in NA

[CatPix]

If you have trouble with the picture quality, you can solder together pings 4, 5, 9 13, 17 and 18, they are grounding pins. Depending on your display it can improve the picture quality.

[pokemontrainer]

Reviving this old thread:

What 8pin DIN connector did you use for the cable? And does the connector differ from the one used in the older G7XXX ?

I bought all components for the RGB mod as described on the site you linked above, including the correct MAB-8-SH socket. I then ordered this Odyssey/Videopac rgb cable. Before doing the RGB mod I now realized that the cable connector does not fit in the DIN socket, it must be this other DIN 8 variation mentioned in the mod manual.

 

I have some spare DIN-8 connectors, but those also seem to be the wrong kind, hence I hope someone here can give me a link or article number of a connector that fits into this special MAB-8-SH DIN 8 socket.

 

Thanks

[CatPix]

For 8 pins, there seems to be 2 variations, that are usually called "horseshoe" and circle.

The difference is more obvious on the male connector side :

 

You normally need the 270° one (circular). But apparently, you ordered the 262° socket instead of the 270°, which is why the ready-made cable you bough doesn't fit.

Edited February 27, 2019 by CatPix

[pokemontrainer]

Ok, thanks for the explanation, this makes it much clearer, esp. with the picture.

So the original socket (the one used in the french versions of the G7400 is a circular one and not a horseshoe as described in the RGB mod page? I want to create a mod that is close to the original french model, so I would like to know whether I should order a new socket for the pcb or a connector for the cable.

[CatPix]

I can tell you that on my G7400, they used a circular 270° socket. The 262° one is unusual, I've only seen it used for the SMS and Megadrive as far as video gaming connections goes.

[carlsson]

Yes, Sega and Commodore use the 262 degree horseshoe, possibly a few more (depending on whether you consider e.g. the C64 to be a "video game" or not).

[CatPix]

Hah! I don't remember this; but I think I only saw French C64 with modified Procep RGB out, with a "standard" 270° connector.

I don't remember about my C128D tho. -But after looking on Internet, apparently, on C64 model II and C128, Commodore switched to a 270° connector.

[carlsson]

That is not at all my first hand experience after dealing with both C64C and C128, but it is rather irrelevant in a discussion about the Videopac+ G7400.

[alortegac]

On 6/3/2016 at 6:27 AM, Atari 2600 H.E.R.O said:

 

Sir,

 

Don't Add Resistor and, No Other Wiring/Connections.

 

 

 

 

Here G7400 == G7200 (Only, In RGB To Scart Cable!)

3V/75Ohm, 12V/10kOhm, ... Are The Lines Technical/Electrical Specifications (Voltage/Impedance

Specification).

 

Good Luck.

Hi, is this view from the rear/soldering  or front/plugging side  of the 8din plug? 
 

thanks a lot!