SCSI Interface Connector
The on-board SCSI Interface connector (SCSI) is a 2x25-pin male
header. This interface can be disabled in the event that no hard drive is
present or a separate hard drive controller is installed on the system.
Pin
Description
Pin
Description
2
Data 0
1
Ground
4
Data 1
3
Ground
6
Data 2
5
Ground
8
Data 3
7
Ground
10
Data 4
9
Ground
12
Data 5
11
Ground
14
Data 6
13
Ground
16
Data 7
15
Ground
18
CDP#
17
Ground
20
Ground
19
Ground
22
Ground
21
Ground
24
Ground
23
Ground
26
SCSI Termination
Current
25
No Connection
28
Ground
27
Ground
30
Ground
29
Ground
32
ATN#
31
Ground
34
Ground
33
Ground
36
BUSY#
35
Ground
38
ACK#
37
Ground
40
RST#
39
Ground
42
MSG#
41
Ground
44
SEL#
43
Ground
46
C/D#
45
Ground
48
REQ#
47
Ground
50
I/O#
49
No Connection
Page 20 486MIS System Board User's Manual
