IBM pseries 630 6C4 Installation Manual page 48

If you have a parallel device (such as a printer), connect it to the parallel connector (4).
1 Serial Port 1 Connector
1a Serial Port 1 Front Connector (RJ48)
2 Serial Port 2 Connector
3 Serial Port 3 Connector
4 Parallel Connector
Eserver pSeries 630 Model 6C4 and Model 6E4 Installation Guide
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