HP ROM-Based Setup Utility - Manual (Page 160)

Embedded Serial Port B
The Embedded Serial Port B option sets the configuration for the internal serial port B. The settings
include the address and IRQ. This option can also disable the port.
NOTE: Embedded Serial Port options may be named Embedded COM Port options, depending
on the server.
160 RBSU menu-driven interface, version 2.xx (G5 and earlier servers)