Chapter 3: Technical Data
Service Manual
31
Single-Ended SCSI
System Monitor
PS/2 Mouse & Keyboard
Speaker
Pin
Description
Pin
Description
Pin
Description
1
PBYPASS
1
Data
1
+5 V (S)
2
OPEN –
3
Ground
2
Speaker –
3
BTI –
4
+5 V
3
Not Connected
4
Ground
5
Clock
5
FAN 3
2, 6
Not Connected
Reset
6
FAN 2
Pin
Description
7
PB_RST –
Modem
1
Reset
8
SMBCLK
Pin
Description
2
Ground
9
VCC_SMB
2
Ring
10
SMBDAT
3
Tip
1, 4
Not Connected
Single-Ended (SE) SCSI
Pin
Description
Pin
Description
Pin
Description
35
Data Bit 12 (I/O)
45
Data Bit 5 (I/O)
62
Control/Data (In)
36
Data Bit 13 (I/O)
46
Data Bit 6 (I/O)
63
Request (In)
37
Data Bit 14 (I/O)
47
Data Bit 7 (I/O)
64
Input/Output (In)
38
Data Bit 15 (I/O)
48
Data Bit Parity Low (I/O)
65
Data Bit 8 (I/O)
39
Data Bit Parity High (I/O)
55
Attention (Out)
66
Data Bit 9 (I/O)
40
Data Bit 0 (I/O)
57
Busy (I/O)
67
Data Bit 10 (I/O)
41
Data Bit 1 (I/O)
58
Acknowledge (Out)
68
Data Bit 11 (I/O)
42
Data Bit 2 (I/O)
59
Reset (I/O)
19, 53
Reserved
43
Data Bit 3 (I/O)
60
Message (In)
17–18,
51–52
Terminator Power (I/O)
44
Data Bit 4 (I/O)
61
Select (I/O)
45
Data Bit 5 (I/O)
1–16, 20–34,
49–50, 54, 56
Ground
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