Gran Premio F1 (Spanish bootleg of Pole Position II):

Documented the 'A' board edge connector. [Arcade Hacker, Rockman, Roberto Fresca]

src/mame/drivers/polepos.cpp

@@ -2208,6 +2208,37 @@ ROM_END
   |                    4          |     | OFF |     | ON  |                       |
   |                    3          |     | ON  |     | ON  |                       |
   '-------------------------------+-----+-----+-----+-----+-----------------------'
+
+
+  Pinouts / Edge Connectors....
+
+
+             A board connector.
+     ---------------+--+------------------
+        Solder Side |PN| Components Side
+     ---------------+--+------------------
+                    |01| GND
+       GEARS SWITCH |02| GND
+     50 PTS COIN-IN |03| GND
+                    |04| GND
+     25 PTS COIN-IN |05| GND
+                +5V |06| +5V
+                +5V |07| +5V
+                +5V |08| +5V
+                    |09|
+                    |10|
+               +12V |11|
+     WHEEL X SIGNAL |12|
+     WHEEL Z SIGNAL |13|
+                -5V |14|
+  AUDIO SIGNAL 1(*) |15| AMP AUDIO SIGNAL (**)
+  AUDIO SIGNAL 2(*) |16| AMP AUDIO SIGNAL (**)
+  AUDIO SIGNAL 3(*) |17|
+  AUDIO SIGNAL 4(*) |18|
+
+  (*)  To 'B' connector.
+  (**) To 'D' connector.
+
 */
 ROM_START( polepos2bs )
 	/* Z80 memory/ROM data */