DOC: DCI Support in Windows NT Video Display Drivers

ID: Q131839

The information in this article applies to:

Microsoft Win32 Device Driver Kit (DDK) for Windows NT, versions 3.51, 4.00

SUMMARY

Section 4.7 - "Supporting Banked Frame Buffers" in the "Win32 Subsystem Driver Design Guide" included with version 3.51 of the Microsoft Windows NT DDK states the following:

NOTE: Windows NT does not currently support the Display Control
Interface (DCI) standard which, through page faulting, would allow a
banked frame buffer to appear as a linear frame buffer the CPU.

This is no longer true in version 3.51 of Windows NT which does limited DCI support. For an example, please see <ddk>\src\video\displays\framebuf or \vga in version 3.51 of the Windows NT DDK. DCI is implemented in dci.c and escape.c. Off-screen surfaces are not supported.

NOTE: DCI support has been permanently removed from the system under Windows NT 4.0. Therefore, all DCI code used in your Windows NT version 4.0 driver must be removed.

For more information, see Appendix A: "Porting Graphics Drivers To Windows NT 4.0 from 3.51" in the "Graphics Drivers Design Guide" included in version 4.0 of the Windows NT DDK.

Additional query words: 3.51 4.00

Keywords : kbdocfix ntddkvideo
Version : 3.51 4.00
Platform : NT WINDOWS
Issue type :