I have finally started to fix/convert back my european Dragon's Lair.
It has been converted to JAMMA.

Luckily, most of the original wiring is still there, but obviously hacked up to use a JAMMA connector. I had some trouble finding the pinouts for the european board (is it any different from the US version?), but I managed to get most of it from studying the schematics.
Does anyone have a european (Atari) Dragon's Lair with original wiring? Can you please take pictures of the connectors to the boards, so I can be sure which cables go where?
For reference, this is what I read from the schematics:
1 UP W/BK
2 DOWN V/W
3 TEST W/OR
4 +5 R/W+R/Y
5 LEFT BU/W
6 RIGHT GY
7
8 +5 R/W
9 COIN R OR
10 COIN L Y
11
12 COUNTERR BU
13 START 2 Y/R
14 START 1 W/R
15 ACTION GN/W
16 5V RTN R/GN
17
18
19 COUNTERR V
20 GND R/BU
21
22 GND W
23 GND W
24 GND BK
25 GND W
26 GND W
27 GND R/GN
28 GND Y/BK
29 DISC AUDIO I/PB BU
30 VOL.CONTROL W/Y
31 +25 W/BN
32
33 1 AUDIO O/P OR
34 2 AUDIO O/p BN
35 VOL.WIPER R
36 DISC AUDIO I/PA BK
J5
1 RED Y/R
2 GND BK
3 BLUE Y/BU
4 SYNC V/W
5
6 GREEN Y/GN (KEY)