 |
» |
|
|
|
There are now two keyboards available for Hewlett-Packard
workstations. In addition to the 46021 keyboard, a personal computer-style
keyboard, C1429 is also available. This new keyboard is also known
as the "Enhanced Vectra" keyboard. Understanding the Keyboards | |
If an application is reading input directly from the keyboard,
it receives a keycode when a key is pressed.
Equivalent keys on the two keyboards are those that generate the
same keycode. If an equivalent key does not exist, there is no way
to generate the corresponding keycode. In an X Window System environment, keycodes are mapped into
key symbols by the X library. The key
symbols are stored in a keysym table.
Application programs then reference these key symbols when accessing
keys. Equivalent keys are those keys that are mapped to the same
key symbol. One advantage of this mapping is that if a key does
not physically exist on a keyboard, its equivalent key symbol can
be mapped to some other key through the corresponding keycode. Default Keyboard Mapping | |
The default keyboard mapping supplied with the X Window environment
maps the C1429 keyboard to the same key symbols that are used for
the 46021 keyboard. This allows existing X client programs that
expect to receive input from a 46021 keyboard to be used with either
keyboard. However, the result is that some keys on the C1429 keyboard
are mapped to key symbols that do not match the engravings on their
keycaps. Equivalent Keys | |
Some applications may expect to use keys that exist on one
of the keyboards but not the other. In most cases, if a key does
not exist on the keyboard in use, it is still possible to use some
other key that is equivalent. To do this, it is necessary to know
which keys are equivalent on the two keyboards. There are 14 keys on the C1429 keyboard that generate keycodes
equivalent to keys on the 46021 keyboard, but have different engravings
on the keycaps. Some have the same key symbol on both keyboards,
while others do not. These C1429 keys, their 46021 equivalents,
and the corresponding symbol names are shown in the following table. Table 6-14 Title not available (Equivalent Keys ) C1429 Keycap | 46021 Keycap | Default Key Symbol | XPCmodmap Symbol |
|---|
f9 | blank1 | F9 | F9 | f10 | blank2 | F10 | F10 | f11 | blank3 | F11 | F11 | f12 | blank4 | F12 | F12 | Print Screen/SysRq | Menu | Menu | Print | Scroll Lock | Stop | Cancel | Scroll_Lock | Pause/Break | Break/Reset | Break/Reset | Pause/Break | Page Up | | Prior | Prior | Num Lock | System/User | System/User | Num_Lock | End | Select | Select | End | Page Down | | Next | Next | Enter | Return | Return | Return | Alt
(left) | Extend Char
(left) | Meta_L | Alt_L | Alt
(right) | Extend Char
(right) | Meta_R | Alt_R |
Changing Key Mapping | |
X provides the means to change the key mapping, if you so
desire. One way to accomplish this is by running the xmodmap
client program. Hewlett-Packard provides two files in the directory
/usr/lib/X11
to use with xmodmap.
One, XPCmodmap,
causes xmodmap
to change the key mapping to match the keycap engravings on the
C1429 keyboard. The other, XHPmodmap,
causes xmodmap
to change the key mapping to match the keycap engravings on the
46021 keyboard, which are the defaults. This allows either keyboard
to be used with applications that expect the other keyboard, although
only one mapping can be used at any given time. When the mapping
is changed, the X Server notifies all clients that are executing
at that time. Some clients may load the new mapping from the server
right away, but others may have to be restarted in order to recognize
the new mapping. For more information about using the xmodmap
client, see the xmodmap
man page. Execute the following command to change the mapping of the
keys shown above to match the engravings on the C1429 keycaps. /usr/bin/X11/xmodmap /usr/lib/X11/XPCmodmap |
Execute the following command to change the mapping to match
the 46021 keyboard. /usr/bin/X11/xmodmap /usr/lib/X11/XHPmodmap |
The 46021 keyboard has 107 keys, while the C1429 keyboard
has 101 keys. There are 7 keys on the 46021 keyboard whose keycodes
cannot be generated by any key on the C1429 keyboard, and whose
key symbols cannot be generated when using the default keymap for
the C1429 keyboard. The missing keys are: , and Tab
exist elsewhere on the C1429 keyboard, and the others are not needed
by most applications. Applications that do need one or more of them
must assign their key symbols to the keycodes of existing keys.
The xmodmap client
can be used to determine the keycode-to-key symbol mapping of existing
keys, and it can also be used to assign the key symbol to the desired
keycode. These keys use HP specific key symbol names whose correct
spelling can be found in the file /usr/lib/X11/XKeysymDB. The right Ctrl key on the
C1429 keyboard generates a keycode that has no equivalent on the
46021 keyboard. This key has the same effect as the left Ctrl
key by default. Keys not mentioned above exist on both keyboards, and have
the same key symbols. |
Printable version
