NEC SX Service And Reference Manual page 101

9-10 Specifications
Hard Disk Drive Connector
Pin Signal
36 Ground
37 Data5
38 Ground
39 Data10
40 Ground
41 Data6
42 Ground
43 Data9
44 Ground
45 Data7
46 Not Used
47 Ground
48 Ground
49 RESET
50 Ground
CRT Connector Pin Assignments
Pin Signal
1 Red
2 Green
3 Blue
4 OPT1
5 Ground
Ground
6
Ground
7
Ground
8
+5V PnP VESA Vcc
9
10 Ground
11 OPT2
12 PnP VESA Data
13 Horizontal Sync
14 Vertical Sync
15 PnP VESA Clock