IBM E74M - Manual (Page 24)

Specifications
Sync Signal Types
Signal Connector Pin Assignment
Note :No. 5 Pin have to ground on the PC side.
A21
1 5
6 10
11 15
(N.C : No Connection)
Type H. Sync V. Sync
Separate Sync H. Sync V. Sync
Pin Signal(D-Sub)
1 Red
2 Green
3 Blue
4 Ground
5 Self-Test
6 Red Ground
7 Green Ground
8 Blue Ground
9 NC
10 Ground
11 Ground
12 SDA
13 Hori.Sync
14 Vert.Sync
15 SCL