Windows XP Tablet PC Edition Hardware Requirements

Windows XP Tablet PC Edition Hardware Requirements

Microsoft has established unique hardware requirements for manufacturers designing hardware for Windows XP Tablet PC Edition. Every effort was made to balance the need to deliver a positive end-user experience in key scenarios while maintaining maximum flexibility in the hardware manufacturers ability to innovate and differentiate their products based on this platform. Please send an e-mail message to tpc_hreq@microsoft.com if you have any questions about these requirements. In addition to the hardware requirements listed below, it is highly recommended that PC manufacturers design their systems to comply with the Designed for Windows XP guidelines (available at Windows Logo Program for Hardware, http://www.microsoft.com/winlogo/hardware/).

Digitizer:

  • D1.

    The digitizer must report X and Y stylus position coordinates accurately when the stylus tip is within 5 millimeters of the writing surface anywhere within the active display area. Physical contact must not be required to determine the stylus location.

  • D2.

    When the digitizer is active, it must report position coordinates and stylus tip up/down status at least 100 times per second. The sample rate may be reduced to conserve power upon inactivity, but must increase to at least 100 samples per second anytime the pen is in contact with the display surface. Using active sample rates of 133 samples per second is recommended.

  • D3.

    The digitizer resolution must be at least five times greater than the LCD pixel density, but must not be less than 600 points per inch. Although lower digitizer resolutions are permitted, using digitizer resolutions of 1,000 points per inch is recommended. Example: For a 10.4-inch XGA (1024 x 768) display panel, LCD pixel density is 123 points per inch, and therefore the minimum digitizer resolution must be at least 615 points per inch (5 x 123).

  • D4.

    The cursor position must be within 3 millimeters of the point of contact between the stylus tip and the display surface anywhere within the active display area. While rapid response and accurate positioning regardless of varying pen tilt-angles should be designed for, the stylus can be held motionless and orthogonal to the display surface during the screen calibration test.

Power States:

  • P1.

    Resume from S3 to S0 must reliably complete in less than 5 seconds. Resume time is measured by BootVis.exe (available at Fast Boot/Fast Resume for the Windows Platform, http://www.microsoft.com/hwdev/platform/performance/fastboot/default.asp) and includes the sum of Bios Wake + Device init + Apps init. No applications are required to be running during the BootVis test, and the test must be executed with the Tablet PC configured as it s expected to ship. Any applications or services that will run automatically out-of-the-box (such as tray applications provided by the hardware manufacturer, not run-once applications such as end-user registration) must be running during the test. No external peripherals are required to be connected, but all built-in devices must be enabled during the test.

  • P2.

    On a single fully charged battery, S3 must be reliably maintained for at least 72 hours without any external power source.

  • P3.

    Automatic transition from S3 to S4 upon low battery is highly recommended to prevent the potential loss of unsaved user data. The S3 to S4 transition should use an intermediate step at S0. Therefore, it is recommended that if a design provides automatic S3 to S4 transition, the low-battery trigger should be set so that there is sufficient power for the S3 to S0 to S4 transition.

For more complete definitions of S3 and S4 low-power states, please refer to Advanced Configuration and Power Interface Specification Revision 2.0 (ACPI - Advanced Configuration and Power Interface, http://www.acpi.info/index.html). In brief, S3 ( sleep mode ) is a low-latency sleep state where memory context is typically maintained by placing the system RAM into a low-power auto-refresh mode while most other system devices are completely powered down. S4 ( hibernate mode ) is a higher latency but extremely low-power sleep state in which RAM contents are stored to hard disk and restored quickly when the system wakes up. S0 ( awake mode ) is the normal system working state.

Viewing Mode:

  • V1.

    Switching the display between full-screen, native-resolution landscape and portrait orientations without reboot must be supported. For example, a tablet with a 1024 x 786 XGA display must allow switching to portrait mode (768 x 1024) without requiring a reboot.

Removal from Dock:

  • R1.

    If a Tablet PC supports docking, surprise removal must be allowed. Removal of the Tablet PC from the docking station without prior notification must not cause any system instability, and any devices contained in or attached to the dock must enumerate and function properly when the Tablet PC is redocked.

  • R2.

    When the unit is redocked, any device enumeration must be automatic and not require a reboot or other elaborate process.

Legacy-Free:

  • L2.

    Designs must be legacy-free as defined for mobiles in the Microsoft Windows System and Device Requirements 2.0 (available at Technical Requirements for Hardware - Windows Logo Program, http://www.microsoft.com/winlogo/hardware/tech.asp).

CTRL+ALT+DEL or Equivalent Functionality:

  • C1.

    A Tablet PC without an attached keyboard must support a single, dedicated, non-overloaded hardware mechanism for generating the Secure Attention Sequence (SAS), also known as CTRL+ALT+DEL or CAD.

  • C2.

    If the SAS button is implemented as a Human Interface Device (HID), the HID-compliant button driver must provide a keyboard collection to report the SAS event.



Building Tablet PC Applications
Building Tablet PC Applications (Pro-Developer)
ISBN: 0735617236
EAN: 2147483647
Year: 2001
Pages: 73

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