IBM 6C4 - Manual (Page 25)

Model 6E4
1 4 PCI slots 64-Bit 10 Ethernet Connector 2
2 Redundant Power Cable Receptacle 11 Connector Cover (These connectors
are not used with your system.)
3 Primary Power Cable Receptacle 12 Serial Connector 2
4 System Power
Control Network Connector
SPCN2
13 Serial Connector 3
5 System Power
Control Network Connector
SPCN1
14 Serial Connector 1
6 Parallel Connector 15 Mouse Connector
7 Hardware Management
Console Connector
HMC2
16 Keyboard Connector
8 Hardware Management
Console Connector
HMC1
17 Rack Indicator
9 Ethernet Connector 1 18 External SCSI Connector
Chapter 1. Introducing the System 7