Compaq DC7600 HP Compaq dx 7200 and dc7600 Personal Computers, Technical Refer - Page 188

C.2.2 USB-Type Keyboard Transmissions, C.2.3 Keyboard Layouts, C.2.3.1 Standard Enhanced Keyboards

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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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 31 39 40 41 42 43 44 45 46 47 48 49 50 51 30 59 60 61 62 63 64 65 66 67 68 69 70 71 75 76 77 78 79 80 81 82 83 84 85 86 92 93 94 95 96 32 33 34 52 53 54 87 97 98 99 35 36 37 38 55 56 57 72 73 74 58 88 89 90 100 101 91 Figure C-3. U.S. English (101-Key) Keyboard Key Positions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 31 39 40 41 42 43 44 45 46 47 48 49 50 51 59 60 61 62 63 64 65 66 67 68 69 70 103 71 75 104 76 77 78 79 80 81 82 83 84 85 86 92 93 94 95 96 32 33 34 52 53 54 87 97 98 99 35 36 37 38 55 56 57 72 73 74 58 88 89 90 100 101 91 Figure C-4. National (102-Key) Keyboard Key Positions C-4 www.hp.com Technical Reference Guide

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C-4
www.hp.com
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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