Keyboards; Keyboard Differences - HP Visualize c100 Service Handbook

Product Information

Keyboards

Keyboards
There are two types of Hewlett-Packard keyboards
available for use with this workstation.
•
•
CAUTION: Use only devices that conform to the HP-HIL
specification with Hewlett-Packard computer
systems. Devices that are not HP-HIL compatible
but have similar connectors may appear to be
compatible, but will damage your system.

Keyboard Differences

Aside from the obvious difference in the appearance
of the ITF and PS/2 style keyboards due to the
arrangement of the keys, there is also a difference in
the keys and their output codes. Some keys on the ITF
keyboard may not exist on the other keyboard. These
keys generate codes that may not exist as output from
the other keyboard (or may be generated by a different
key). Codes that are generated when a key is pressed
are called keycodes.
Some applications expect to use keycodes generated
by keys existing on the ITF keyboard. Since the keys
do not exist on the PS/2 keyboard, an accommodation
must be made if the PS/2 keyboard is to be used. In
most cases, it is still possible to use some other key
that is equivalent (generates the same keycode from a
different keycap). To do this, it is necessary to know
which keys are equivalent on the two keyboards. Table
5 compares the equivalent keys of the ITF and PS/2
keyboards.
22
PS/2 Keyboard (PS/2 interface)
ITF Keyboard (HP-HIL interface)