KRULL  ( GV-105 )  BOARD MA-456
                                  SOUND MA-487

                                                          SOUND BD
  1                                   A  +5V               1  +12V     
  2  GND                              B  +5V               2  S16
  3  GND                              C  +5V               3  -12V
  4                                   D                    4  S32
  5                                   E                    5  +5V
  6                                   F  CTR               6  GND
  7                                   H                    7  AUDIO OUT
  8                                   J                    8  S1
  9                                   K                    9  S2
 10                                   L                   10  +16V
 11                                   M  S16 TO SND BD    11  S4
 12   S32 TO SND BD                   N                   12  S8
 13                                   P
 14   KEY                             R  1 START
 15   2 START                         S  COIN 1
 16   TEST WHEN OPEN                  T  COIN 2
 17   STEP TEST                       U
 18   FIRE RIGHT                      V  LEFT
 19   FIRE UP                         W  DOWN
 20   FIRE LEFT                       X  RIGHT
 21   UP                              Y  FIRE DOWN
 22   S2 TO SND BD                    Z  S1 TO SND BD
 23   S8 TO SND BD                    a  S4 TO SND BD
 24   VID RED                         b  V SYNC
 25   VID BL                          c  
 26   VID GN                          d  VID GND
 27   +11.5V                          e  H SYNC
 28   GND                             f  +5V
 29   GND                             h  +5V
 30   GND                             j  +5V