This information was taken from the Amiga 3000T manual.

Pin   Name    Description
1     XCLK    External Clock
2     XCLKEN  External Clock Enable
3     RED     Analog Red
4     GREEN   Analog Green
5     BLUE    Analog Blue
6     DI      Digital Intensity (47 Ohm)
7     DB      Digital Blue (47 Ohm)
8     DG      Digital Green (47 Ohm)
9     DR      Digital Red (47 Ohm)
10    CSYNC   Composite Sync
11    HSYNC   Horizontal Sync (47 Ohm)
12    VSYNC   Vertical Sync (47 Ohm)
13    GNDRTN  Return for XCLKEN
14    ZD      Zero Detect (47 Ohm)
15    C1      Clock Out
16    GND
17    GND
18    GND
19    GND
20    GND
21    -12V    -12 Volts DC (50ma)
22    +12V    +12 Volts DC (100 mA)
23    +5V     +5 Volts DC (100mA)