HP 330 Service Information Manual page 146

Note that if keyboard electronics and a remote terminal are both present in a system, they
will both be enabled. Similarly, if accessory card keyboard electronics and a remote console are
both present in a system, they will both be enabled, provided no other keyboard electronics are
present.
When more than one set of accessory card keyboard electronics is present, then the one with
the lowest select code is enabled. If several HP 98700s exist on a system, then it is the user's
responsibility to ensure that the accessory card keyboard electronics associated with the HP
98700 display controller at the address 56000016 has the lowest select code of all accessory card
keyboard electronics in the system. This must be done to ensure that the keyboard associated
with HP 98700 "A" is not input console while the display of HP 98700 "B" is output console.
The Boot ROM does not attempt to verify the display/keyboard relationship.
If no output device is present, but a keyboard is present, then that keyboard will still act as
the console input device. Similarly, if no input device is present, but a video output is present,
then that video output will still act as the console output device. If neither an input device nor
an output device is present, the Boot ROM will go ahead and autornatically Boot the default
operating systems as long as no errors are discovered during self test. Refer to the section on
Self-Test for more details.
Remote terminals as consoles are discussed in more detail in the next section.
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Boot ROM Functions