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C-4 361834-002 Technical Reference Guide
Keyboard
C.2.2 USB-Type Keyboard Transmissions
The USB-type keyboard sends essentially the same information to the system that the PS/2
keyboard does except that the data receives additional NRZI encoding and formatting (prior to
leaving the keyboard) to comply with the USB I/F specification (discussed in chapter 5 of this
guide).
Packets received at the system's USB I/F and decoded as originating from the keyboard result in
an SMI being generated. An SMI handler routine is invoked that decodes the data and transfers
the information to the 8042 keyboard controller where normal (legacy) keyboard processing
takes place.
C.2.3 Keyboard Layouts
Figures C-3 through C-8 show the key layouts for keyboards shipped with HPsystems. Actual
styling details including location of the HP logo as well as the numbers lock, caps lock, and
scroll lock LEDs may vary.
C.2.3.1 Standard Enhanced Keyboards
Figure C-3. U.S. English (101-Key) Keyboard Key Positions
Figure C-4. National (102-Key) Keyboard Key Positions
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