64 MotherBoard                     Keyboard
keyboard pins     meaning   DB-25   Label      Cable Color
---------------   -------   -----   --------   -----------
1                  gnd        1        I       white
2              not connected  2
3                restore      3        8       black
4              not connected  4
5                  r3         5        7       grey
6                  r6         6        6       purple
7                  r5         7        5       blue
8                  r4         8        4       green
9                  r7         9        3       yellow
10                 r2         10       2       orange
11                 r1         11       1       red
12                 r0         12       0       brown
13                 c0         13       H       grey-white
14                 c6         14       G       purple-white
15                 c5         15       F       blue-white
16                 c4         16       E       green-white
17                 c3         17       D       yellow-white
18                 c2         18       C       orange-white
19                 c1         19       B       red-white
20                 c7         20       A       brown-white