IBM PC 100, Technical Manual

Page: 28 / 58

Chapter 2. Connectors and Jumpers
Power Supply Connectors
The power supply utilizes 4-pin connectors for internal devices. The total power used by the connectors
must not exceed the amount shown in Figure 10 on page 12.
4 3 2 1
The following figure shows the signal and pin assignments for the system board 12-pin power supply
connector.
Figure 16 (Page 2 of 2). PCI Connector Signal and Pin Assignments
Pin Signal Pin Signal
55A Address/Data 4 55B Address/Data 5
56A Ground 56B Address/Data 3
57A Address/Data 2 57B Ground
58A Address/Data 0 58B Address/Data 1
59A
+
5 V dc (I/O) 59B
+
5 V dc (I/O)
60A REQ64# 60B ACK64#
61A
+
5 V dc 61B
+
5 V dc
62A
+
5 V dc 62B
+
5 V dc
ñ
The 3.3-volt PCI bus pins are attached to a connector on the riser card that can be used as an input for 3.3 volts. The
system does not provide this power.
Figure 17. Power Supply Connector (Internal Devices) Signal and Pin Assignments
Pin Signal Pin Signal
1
+
12 V dc 3 Ground
2 Ground 4
+
5 V dc
Figure 18. Power Supply Connector (System Board) Signal and Pin Assignments
Pin Signal Pin Signal
1 Power good (
+
5 V dc) 2
+
5 V dc
3
+
12 V dc 4
−
12 V dc
5 Ground 6 Ground
7 Ground 8 Ground
9
−
5 V dc 10
+
5 V dc
11
+
5 V dc 12
+
5 V dc
20
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