Keyboards; Keyboard Differences - HP Visualize J2240 Service Handbook

Keyboards

There are two types of Hewlett-Packard keyboards available for use with this
workstation. They are the following:
D
PS/2 Keyboard
D
ITF Keyboard
CAUTION: Use only devices that conform to the HP-HIL specifi-
cation with Hewlett-Packard computer systems. De-
vices that are not HP-HIL compatible but have simi-
lar 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 PC style
keyboards due to the arrangement of the keys, there is also a difference in the keys
and their output codes. Some keys on one keyboard (the ITF keyboard for example)
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 one of the
keyboards (the ITF keyboard for example). Since the keys do not exist on the other
keyboard (the PC keyboard for example), an accommodation must be made if the PC
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 1–7
compares the equivalent keys of the ITF and PC keyboards.
NOTICE: Keyboard keys not mentioned in Table 1–7 are the
same on both keyboards.
Product Information 1–19