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Author Topic: build a RGB Scart cable (Read 20231 times)

Offline Zozosoft

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build a RGB Scart cable
« on: 2008.January.21. 21:45:13 »
Enterprise pinouts
SCART pinout

Connected wires: RED, GREEN, BLUE, CSYNC and AUDIO Left and Right, Mode Switch, and signal Grounds.

Because the Enterprise not produce standard signal levels, not all monitors can display correctly the EP picture.
For correcting this, needed to put some resistors to signal wires:



Offline marcof

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Re: build a RGB Scart cable
« Reply #1 on: 2008.March.22. 19:22:36 »
Is it possible to make an S-Video or Composite cable as well?
If so, where can I order it, I'm not good with soldering stuff :)

Offline Zozosoft

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Re: build a RGB Scart cable
« Reply #2 on: 2008.March.22. 19:33:01 »
The Enterprise have only monochrome composite video signal in the monitor connector.
For use a color composite video signal, needed some modifications inside the machine.

Offline marcof

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Re: build a RGB Scart cable
« Reply #3 on: 2008.March.22. 19:36:04 »
crap, looks like I have to ask a friend to modify it then. Does the above also show the modification in the EP?

Offline SlashNet

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Re: build a RGB Scart cable
« Reply #4 on: 2008.September.07. 10:58:58 »
I have monitor with RGB input (Samsung SynkMaster 700p+) with BNC connectors (R) (G) (B) (H/V) (V)

It's possible to connect it to EP?
« Last Edit: 2008.September.07. 11:05:11 by SlashNet »

Offline Z80System

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Re: build a RGB Scart cable
« Reply #5 on: 2008.September.07. 15:30:31 »
Probably it's not possible. I have a few modern VGA monitors with those connectors, but none of them can work with those low frequencies what EP has. It is still possible that your monitor is an exception, but only a very few monitor can work on those frequencies.
Z80 System

Offline SlashNet

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Re: build a RGB Scart cable
« Reply #6 on: 2008.September.07. 16:52:59 »
That's BAD :(...

but how can I test that?

what pins must be connected (except RGB)
EP
HSYNC
VSYNC
CSYNC


Monitor
H/V
V

Offline Z80System

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Re: build a RGB Scart cable
« Reply #7 on: 2008.September.07. 17:52:20 »

I don't know exactly the electronic standards whose signals are the signals named r,g,b, v, h/v, hsync, vsync, csync. As far as I know, you cannot exactly know what is on one connector when it is named for example csync. There are different composite syncron signals in the electronic industry. You have to know the special device to know what is on its connector named csync. So I usually make some try. These signals are very low level ones, nothing will happen when you connect the wrong connectors. You will not have picture, or good picture only, at a wrong connector combination.

So we are sure in 4 connectors:

r (monitor) - r (EP)
g (monitor) - g (EP)
b (monitor) - b (EP)
v (monitor) - vsync (EP)

you have to try only two combinations:

h/v (monitor) - hsync (EP)

         or

h/v (monitor) - csync (EP)

One monitor will understand, and work with both hsync and csync, one will understand only one of them.

Maybe your monitor will not switch to the BNC input automatically, in this situation you have to switch it manually from the monitor's menu.

But 99% after the connection you will see a black screen, or a text something like this:

Out of frequency

If you will have a good picture, I will buy a monitor like your one ! :)

Good luck!


Z80 System

Offline SlashNet

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Re: build a RGB Scart cable
« Reply #8 on: 2008.September.07. 18:19:18 »
Thanks!

I'll try it next week (or two...)
« Last Edit: 2008.September.07. 18:22:45 by SlashNet »

Offline pepax

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Re: build a RGB Scart cable
« Reply #9 on: 2008.September.30. 22:05:40 »
This is the result:
CRT TV:
1552-0
1554-1
LG M208WA LCD
1556-2
1558-3

Tried to omit the resistors but it didn't work - the LCD showed only a hint of the text on white screen, the TV showed just a white screen.
« Last Edit: 2008.September.30. 22:09:32 by pepax »

Offline Zozosoft

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Re: build a RGB Scart cable
« Reply #10 on: 2008.September.30. 22:16:33 »
This is the result:
Great!
Quote
Tried to omit the resistors but it didn't work - the LCD showed only a hint of the text on white screen, the TV showed just a white screen.
Yes, only few displays works without the resistors, for example Philips CM833x

Offline Mika73

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Re: build a RGB Scart cable
« Reply #11 on: 2008.December.17. 14:37:58 »
Is it possible buy monitor cable somewere?  :oops:

Offline SlashNet

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Re: build a RGB Scart cable
« Reply #12 on: 2012.June.12. 15:39:12 »
Prompt the correct connection:

Offline Zozosoft

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Re: build a RGB Scart cable
« Reply #13 on: 2012.June.12. 16:04:25 »
Prompt the correct connection:
It is a GND (A2 or B2).

Offline SlashNet

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Re: build a RGB Scart cable
« Reply #14 on: 2012.August.05. 23:34:58 »
Hello.
Prompt where I must connect Mode Switch and CSYNC


Simply, I'm afraid do something wrong. :oops: