I know this is old but I came across this problem and there are few people with the same issue. So here we go.
(50PIN) (25 PIN)
12 -n/a
13 -n/a
14 -n/a
42 -n/a
49 1 - REQUEST
46 2 - MESSAGE
50 3 - INPUT/OUTPUT
45 4 - RESET
44 5 - ACKNOWLEDGE
43 6 - BUSY
1-25 7 - GROUND
26 8 - DATA 0
1-25 9 - GROUND
29 10 - DATA 3
31 11 - DATA 5
32 12 - DATA 6
33 13 - DATA 7
1-25 14 - GROUND
48 15 - CONTROL/DATA
1-25 16 - GROUND
41 17 - ATTENTION
1-25 18 - GROUND
47 19 - SELECT
34 20 - DATA PARITY
27 21 - DATA 1
28 22 - DATA 2
30 23 - DATA 4
1-25 24 - GROUND
38 25 - TERMINATOR POWER
