How to...
Build a Sega/Jamma Adapter (Quartett)

Arcades  TechFAQs

  Sega Board and upper sideJamma Connector and upper side

Okay...I will make this short...for the below example think the above picture tuned 90° clockwise, Sega board at 12 o´clock and jamma connector at 6...

Segaboard upper side of connector (female) is numbered (left to right, connectorof the BOARD! looking towards you):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Segaboard lower side of connector is numbered:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b

Jamma (male) conector upper side  is numbered (left to right, jamma male connector looking towards you):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Jamma connector lower side is numbered:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b

So far so good...now connect Upper Side first...

Segaboard  ---> Jamma Connector
1 ---> 1               
2 ---> 2              
3 ---> 3               
4 ---> 4               
5 ---> 6               
6 ---> 8                
7 not used        
8 ---> 24
9 ---> 23
10 ---> 22
11 not used
12 ---> 19
13 ---> 18
14 ---> 21
15 ---> 20
16 not used
17 not used
18 not used
19 not used
20 ---> 16
21 ---> P
22 ---> 15
23 ---> N
24 ---> 10
25 ---> 12
26 ---> 13
27 ---> 28
28 ---> 14+27         Not used 5, 7, 9, 11, 25, 26

And now Lower side...

A ---> A
B ---> B
C ---> C
D ---> D
E ---> F
F ---> H
G not used
H ---> X
I ---> W
J ---> V
K not used
L ---> S
M ---> R
N ---> U
O ---> T
P not used
Q not used
R not used
S not used
T ---> 17
U ---> Q
V not used
W not used
X ---> J
Y ---> L
Z ---> M
a ---> a
b ---> b                 Not used E, G, I, K, O, Y, Z

Any feedbacks and comments please to wz@vienna.at Thanx!!!