Capcom pinouts from ant@palm.cray.com (Tony Jones)

Capcom pcb (56pin), not Jamma
-----------------------------
gnd     A 1     gnd             
gnd     B 2     gnd             
+5v     C 3     +5v             
+5v     D 4     +5v             
Green   E 5     Red             
Sync    F 6     Blue            
gnd     H 7     gnd             
-key-   J 8     -key-           
2shot2  K 9     1shot2          
2shot1  L 10    1shot1          
2up     M 11    1up             
2down   N 12    1down           
2left   P 13    1left           
2right  R 14    1right          
gnd     S 15    gnd
select2 T 16    select1
(d5)    U 17    (d4)
coin2   V 18    coin1
gnd     W 19    gnd
n/c     X 20    n/c
n/c     Y 21    n/c
12v com Z 22    12v com
count2  a 23    count1
audio-  b 24    audio+
+12v    c 25    +12v
12v gnd d 26    12v gnd
gnd     e 27    gnd
gnd     f 28    gnd


Data East rf/converter board for Capcom Commando pcb
----------------------------------------------------
2down   A 1     1down           
2up     B 2     1up             
2left   C 3     1left           
2right  D 4     1right          
n/c     E 5     n/c             
n/c     F 6     n/c             
n/c     H 7     n/c             
n/c     J 8     n/c             
2shoot1 K 9     1shoot1         
2shoot2 L 10    1shoot2         
select2 M 11    select1         
coin2   N 12    coin1
count2  P 13    count1
Green   R 14    Blue
Red     S 15    Sync
n/c     T 16    n/c
audio-  U 17    audio+
n/c     V 18    +12v
+5v     W 19    +5v
+5v     X 20    +5v
gnd     Y 21    gnd (video)
gnd     Z 22    gnd