Manual Intermec 751G (page 114 of 156) (English)

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Chapter 3 — Configuring the Computer

100 751G Color Mobile Computer User’s Manual

For the 751G keypad, these registry keys contain the plane mappings:

• The unshifted plane mapping is in the registry at:

HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\KEYBD\Vkey

• The orange plane mapping is in the registry at:

HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\KEYBD\VkeyGold

• The alpha plane mapping is in the registry at:

HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\KEYBD\VkeyAlpha

How Key Values Are Stored in Registry

To know which fields to update in the registry, you must know what Scan

Codes are assigned to each physical key (see the table starting on the next

page). The Scan Code is used at the lowest level of the system to let the

keypad driver know which physical key was pressed. The keypad driver

takes that scan code and looks it up in a table (a copy of the one stored in

the registry) to determine which values to pass on to the operating system.

Each registry key is just an array that describes to the keypad driver what

value needs to be passed for each physical key. The key values are indexed

by the scan code, this is a zero-based index. For example in the unshifted

plane, the [4] key has a scan code of 0x06. This means that the seventh

word under the “Vkey” registry key has the value for the [4] key. Taking a

sample of the “Vkey” registry key shows the following values:

00,00,0B,05,02,03,C1,07,04,03,BE,00,34,00,00,00,. . .

The value is 34,00. The values are in reverse byte order because that is the

way the processor handles data. When writing an application, nothing

needs to be done to swap the bytes, as this happens automatically when the

data is read into a byte value. This is something to be aware of when

looking at the registry. Knowing this, we can see that the value that the

keypad driver passes to the system is a hex 34. Looking that up on an

UNICODE character chart, we see that it maps to a “4”. If you wanted the

key, labeled “4”, to output the letter “A” instead, you would need to change

the seventh word to “41” (the hexadecimal representation of “A” from the

UNICODE chart), then put the key back into the registry.

If you wish to disable a certain key, remap its scan code to 0x00.

Change Notification

Changing registry keys alone does not immediately change key mappings.

To notify the keypad driver the registry was updated, use the CreateEvent()

API to signal the “ITC_KEYBOARD_CHANGE” named event.

Note: Do not remap scan codes 0x01, 0x41, 0x42, 0x43, 0x44. Remapping

these could render the 751G unusable until a cold-boot is performed.

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Intermec 751G Manual

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