IBM F50 RS/6000 7025 - Manual (Page 149)

Input/Output Connectors
Parallel Connector: One 25-pin parallel port is provided.
Serial Connectors: Three 9-pin serial connectors (1, 2, and 3) are provided. If you are
using a 25-pin signal cable, you need a 9-pin-to-25-pin adapter cable.
Mouse Connector: This is where the mouse cable connects to the system. This connector
sometimes is called an auxiliary-device or pointing-device port.
Keyboard Connector: The cable from your keyboard connects here.
Ethernet Connector: The cable from your Ethernet LAN connects here.
External SCSI Connector: The cable from your external SCSI bus connects here.
Chapter 5. Installing Options 5-5