EPC-2102 Single-Board Computer
30
Service Manual
Pin Signals (continued)
The tables below list the pin signals for each peripheral header. The following illustration
(
) indicates the pin positions for each.
Table 11. Peripheral Header Pin Signals
EIDE
PS/2 Mouse
Pin
Description
Pin
Description
Pin
Description
1
Reset (Out)
21
DMA Request (I/O)
1
Data
3
Data 7 (I/O)
23
- I/O Write (Out)
2
Clock
4
Data 8 (I/O)
25
- I/O Read (Out)
3-8
Not Connected
5
Data 6 (I/O)
27
I/O Channel Ready (In)
9
Ground
6
Data 9 (I/O)
28
+ ALE
10
+5 V
7
Data 5 (I/O)
29
DMA Acknowledge(Out)
8
Data 10 (I/O)
31
+ IRQ14 (In)
Keyboard
9
Data 4 (I/O)
32
I/O CS16 (Out)
Pin
Signals on
Board
Description
Pin
Signals on
Cable
10
Data 11 (I/O)
33
+ ADDR1 (Out)
1
Reset
8
11
Data 3 (I/O)
34
Passed Diagnostics
2
Ground
7
12
Data 12 (I/O)
35
+ ADDR0 (Out)
3
Not Connected
6
13
Data 2 (I/O)
36
+ ADDR2 (Out)
4
Keyboard Clock
5
14
Data 13 (I/O)
37
- CS0 (Out)
5
Keyboard Data
4
15
Data 1 (I/O)
38
- CS1 (Out)
6
Keyboard Lock
3
16
Data 14 (I/O)
39
Activity Light (Out)
7
+5 V
2
17
Data 0 (I/O)
2, 19,
22, 24,
26, 30,
40
Ground
8
Speaker
1
18
Data 15 (I/O)
20
Not Connected
SCSI
USB
Pin
Description
Pin
Description
Pin
Description
35
DB12 (I/O)
59
- RST (I/O)
1
USB Port +
36
DB13 (I/O)
60
- MSG (In)
2
Ground
37
DB14 (I/O)
61
- SEL (I/O)
3
USB Port -
38
DB15 (I/O)
62
- CD (In)
4
+5 V
39
DBPH (I/O)
63
- REQ (In)
40
DB0 (I/O)
64
- I/O (In)
IDE/SCSI Activity LED
41
DB1 (I/O)
65
DB8 (I/O)
Pin
Description
42
DB2 (I/O)
66
DB9 (I/O)
1
+5 V
43
DB3 (I/O)
67
DB10 (I/O)
2
Drive LED
44
DB4 (I/O)
68
DB11 (I/O)
45
DB5 (I/O)
19, 53
Reserved
Auxiliary CPU Fan
46
DB6 (I/O)
17-18,
51-52
TRMPWR
Pin
Description
47
DB7 (I/O)
1
Ground
48
DBPL (I/O)
1-16,
20-34,
49-50,
54, 56
Ground
2
+12 V
55
- ATN (Out)
3
Ground
57
- BSY (I/O)
58
-ACK (Out)
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