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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Summary of Contents for Compaq dc71 Series
Page 50: ...2 34 361834 002 Technical Reference Guide System Overview ...
Page 58: ...3 8 361834 002 Technical Reference Guide Processor Memory Subsystem ...
Page 126: ...5 40 361834 002 Technical Reference Guide Input Output Interfaces ...
Page 168: ...8 20 361834 002 Technical Reference Guide BIOS ROM ...
Page 188: ...A 20 361834 002 Technical Reference Guide Error Messages and Codes ...
Page 192: ...B 4 361834 002 Technical Reference Guide ASCII Character Set ...
Page 210: ...C 18 361834 002 Technical Reference Guide Keyboard ...
