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Author Topic: G7400 RGB cable  (Read 286 times)
grips03
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« on: March 18, 2018, 05:19:40 AM »

Below is schematic for G7400 RGB cable.  

I've noticed certain grounds missing as compared to other Euro RGB cables I've seen.  Is this in fact how the stock cable is wired?  Grounds missing on Pins 5,9,13,21,10,14,18.

Is Status CVBS and Status RGB both needed for RGB cable?

Is Pin 16 needed?  I noticed a Sega Genesis cable sends Composite Sync into 180ohm resistor and then routes that signal to Blanking (Pin 16).




« Last Edit: March 18, 2018, 05:25:55 AM by grips03 » Logged
grips03
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« Reply #1 on: March 18, 2018, 06:04:26 AM »

Found another post for G7200.  Looks they might be the same wiring. 
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grips03
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« Reply #2 on: March 18, 2018, 08:17:28 AM »

Looks like  pin 8 is not needed.  
16 is need to autoswitch to RGB input - Status RGB signal.


Pin 8, the switch signal pin, carries a DC voltage from the source that indicates the type of video present.

    0 V2 V means no signal, or internal bypass
    4.5 V7 V (nominal 6 V) means a widescreen (16:9) signal
    9.5 V12 V (nominal 12 V) means a normal (4:3) signal

Pin 16, the blanking signal pin, carries a signal from the source that indicates that the signal is either RGB or composite.

    0 V0.4 V means composite.
    1 V3 V (nominal 1 V) means RGB only.
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Alessandro
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« Reply #3 on: March 21, 2018, 03:49:42 PM »

Some old CRTs don't have a way to manually select the SCART input and instead rely on the voltage on pin 8 to switch to it (I had one TV like that in the past). It's also nice that the TV can be automatically set to the correct aspect ratio, since you can tap 12V from a 7400 (on other consoles you only have 5V and it's a little more trickier to get an on-spec signal for 4/3 aspect ratio).

So you can skip pin 8 on the vast majority of TV sets out there, but you'll get better compatibility by including it.

Some upscalers, like the OSSC, might not need pin 16 either but, again, including it takes only little effort and ensures better compatibility.
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