NEC SX Service And Reference Manual page 100

Hard Disk Drive Connector
Pin Signal
1 HDD Access LED
2 +5V
3 Chip Select 0
4 +5
Chip Select 1
5
+5V
6
Address 0
7
+5V
8
Address 2
9
10 +5V
11 Address 1
12 +5V
13 Diagnostic
14 Not Used
15 IRQ
16 Not Used
17 Not Used
18 I/O Channel Ready
19 MS Select
20 I/O Write
21 I/O Read
22 Not Used
23 Data0
24 Data1
25 Data15
26 Data14
27 Data2
28 Data13
29 Data3
30 Not Used
31 Data12
32 Ground
33 Data4
34 Ground
35 Data4
Specifications 9-9