using A520 on Speccy

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Spectrum +3. http://www.worldofspectrum.org/faq/reference/pinouts.htm

RGB              Pin  Signal              Level
                         -------------------------------------------------
1                        +12V
2    GND                 0V
3    Audio Out
4   /Composite Sync     TTL
5                        +12V
6    Green               Analogue 1.67V p-p
7    Red                 Analogue 1.67V p-p
8    Blue                Analogue 1.67V p-p


Amiga Video port.

1    /XCLK    IN    Extern Clock
2    /XCLKEN    IN    Extern Clock Enable (47 Ohm)
3    RED    OUT    Analog Red (75 Ohm)
4    GREEN    OUT    Analog Green (75 Ohm)
5    BLUE    OUT    Analog Blue (75 Ohm)
6    DI    OUT    Digital Intensity (47 Ohm)
7    DR    OUT    Digital Red (47 Ohm)
8    DG    OUT    Digital Green (47 Ohm)
9    DB    OUT    Digital Blue (47 Ohm)
10    /CSYNC    OUT    Composite Sync (47 Ohm)
11    /HSYNC    OUT    Horizontal Sync (47 Ohm)
12    /VSYNC    OUT    Vertical Sync (47 Ohm)
13    GNDRTN    ------    Digital Ground (for /XCLKEN) Don't connect with pin 16-20.
14    /PIXELSW    OUT    Genlock overlay (47 Ohm)
15    /C1    OUT    Clock out (47 Ohm)
16    GND    ------    Video Ground
17    GND    ------    Video Ground
18    GND    ------    Video Ground
19    GND    ------    Video Ground
20    GND    ------    Video Ground
21    -12V    OUT    -12 Volts DC (10 mA max) (A500/A600/A1200)
     -5V    OUT    -5 Volts DC (10 mA max) (A1000/A2000/A3000/A4000)
22    +12V    OUT    +12 Volts DC (100 mA max)
23    +5V    OUT    +5 Volts DC (100 mA max)