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90 pins connector at the computer
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90 pin (36+54) EDGE connector 

Pin Name Dir Description
1 RGB16 --> Red Bit 0
2 RGB17 --> Red Bit 1
3 LINELF --> Audio Line Out Left
4 LINERT --> Audio Line Out Right
5 C28D --> Pixel-Synchronous Clock
6 +5V - +5 Volts DC (1 A)
7 ARED --> Analog Red
8 +5V - +5 Volts DC (1 A)
9 GND - Digital Ground
10 +12V - +12 Volts DC (40 mA)
11 AGREEN --> Analog Green
12 GND - Digital Ground
13 GND - Digital Ground
14 /CSYNC --> Composite Sync
15 ABLUE --> Analog Blue
16 /XCLKEN <-- Genlock Clock Enable
17 GND - Digital Ground
18 BURST --> Burst Gate
19 /C4 --> 3.55/3.58 MHz Clock
20 GND - Digital Ground
21 GND - Digital Ground
22 /HSYNC --> Horizontal Sync (47 Ohm)
23 RGB4 --> Blue Bit 4
24 GND - Digital Ground
25 RGB7 --> Blue Bit 7
26 /VSYNC --> Vertical Sync (47 Ohm)
27 RGB15 --> Green Bit 7
28 BLANK --> Video Blank
29 RGB23 --> Red 7
30 /PIXELSW --> Genlock Overlay (47 Ohm)
31 -5V - -5 Volts DC
32 GND - Digital Ground
33 /XCLK <-- Genlock Clock
34 /C1 --> C1 Clock
35 +5V - +5 Volts DC (1 A)
36 PSTROBE --> Printer Port Handshake
       
1 GND - Digital Ground
2 RGB20 --> Red Bit 4
3 RGB21 --> Red Bit 5
4 RGB22 --> Red Bit 6
5 GND - Digital Ground
6 RGB12 --> Green Bit 4
7 RGB13 --> Green Bit 5
8 RGB14 --> Green Bit 6
9 GND - Digital Ground
10 RGB5 --> Blue Bit 5
11 RGB6 --> Blue Bit 6
12 GND - Ground
13 SOG --> Sync-On-Green Indicator
14 TBASE --> 50/60 Hz Software Clock Timebase
15 CDAC --> 7.09/7.16 MHz Clock
16 PPOUT <-> Printer Port Paper Out
17 /C3 --> 3.55/3.58 MHz Clock
18 PBUSY <-> Printer Port Busy
19 /LPEN <-- Light Pen Input
20 /PACK <-> Printer Port Acknowledge Handshake
21 PSEL --> Printer Port Select
22 GND - Digital Ground
23 PPD0 <-> Printer Port Data Bit 0
24 PPD1 <-> Printer Port Data Bit 1
25 PPD2 <-> Printer Port Data Bit 2
26 PPD3 <-> Printer Port Data Bit 3
27 PPD4 <-> Printer Port Data Bit 4
28 PPD5 <-> Printer Port Data Bit 5
29 PPD6 <-> Printer Port Data Bit 6
30 PPD7 <-> Printer Port Data Bit 7
31 /LED --> LED (Audio filter bypass) Setting
32 GND - Digital Ground
33 RAWLF --> Raw (Unfiltered) Audio Left
34 AGND - Audio Ground
35 RAWRT --> Raw (Unfiltered) Audio Right
36 AGND - Audio Ground
37 n/c - Reserved for future expansion
38 n/c - Reserved for future expansion
39 GND - Digital Ground
40 GND - Digital Ground
41 n/c - Reserved for future expansion
42 n/c - Reserved for future expansion
43 GND - Digital Ground
44 GND - Digital Ground
45 RGB18 --> Red Bit 2
46 RGB19 --> Red Bit 3
47 RGB8 --> Green Bit 0
48 RGB9 --> Green Bit 1
49 RGB10 --> Green Bit 2
50 RGB11 --> Green Bit 3
51 RGB0 --> Blue Bit 0
52 RGB1 --> Blue Bit 1
53 RGB2 --> Blue Bit 2
54 RGB3 --> Blue Bit 3

Note: Direction is Motherboard relative Card.
Note: Do not mix analog & digital grounds.

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Source(s) of this and additional information: Amiga 4000 User"s Guide from Commodore, from Hardware Book
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