RGB Scart


Sam Coupé | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

The Coupé SCART socket to handle all video and sound outputs, note that not all connections are standard as it also has +5V and +12V inputs, TTL level ouput and a lightpen connection, perhaps the voltage lines were added to allow for a single cable to be connected to the Coupé as was shown in some of the marketing material of the time.

PINSIGNALPINSIGNAL
1AUDIO OUT RH2SPEN
3AUDIO OUT LH4AUDIO EARTH
5BLUE EARTH6BLUE TTL OUT
7BLUE LIN. OUT8RED TTL OUT
9GREEN EARTH10GREEN TTL OUT
11GREEN LIN. OUT12+5V POWER IN
13RED EARTH14CSYNC EARTH
15RED LIN. OUT16CSYNC
17C VID EARTH18+12V POWER IN
19C VID OUT20BRIGHT TTL OUT
21GND.  

Cable Details

When making a cable you will need to add a 470 Ohm resister between pins 16 and 20 on the TV side to prevent saturation of the signal.

Sam PinSignalCableTV PinSignal
1AUDIO R/H——2AUDIO INPUT B
3AUDIO L/H——6AUDIO INPUT A
4AUDIO EARTH——4AUDIO EARTH
7BLUE OUT——7BLUE
11GREEN OUT——11GREEN
14CSYNC EARTH——14CSYNC EARTH
15RED OUT——15RED
16CSYNC——16BLANKING
   -/\/\/-470 OHM RESISTOR (between 16 and 20)
   20VIDEO INPUT
21SCREEN——21SCREEN

In recent years with widescreen and now LCD/Plasma televisions it is more important to feed a voltage into the standard SCART pin 16 (blanking), the above pin-out allows this but at the expense of stressing the CSYNC line - an alternative is to use a flylead to pick up the 5V line (not the +5V input line on the SCART which is wired before the internal power switch) from the Lightpen/Audio port and feed it through a suitable resistor to get the required 1-3V to select RGB mode.


scart adapter to composite

do you think two sams with scart to composite adapters would enable a composite splitter on the input of my tv tuner vga cards tv encoder to display two sam video outputs as one?

Re: composite splitter

I really don’t think that would work, and you might damage the Sams if you try… apart from anything else they won’t be synchronised.


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