## Display Device Driver Reference for OS/2

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### The Physical Device Driver-SCREENDD

To build SCREEN01.SYS and SCREEN02.SYS, run NMAKE.EXE in the DDK_x86\SRC_ DBCS\ DEV\SCREENDD directory.

All source code is included in the IBM Developer Connection Device Driver Kit for OS/2, so modifications to any code can be done, if necessary.

MEMHELP.ASM and DDK_x86\INC_DBCS\MEMHELP.INC are the files newly added for DBCS support.

To support BVHVGA2.DLL, FNTCALLS.DLL and VFNTV.SYS, the new IOCtl and interface to the virtual device driver are added. The following section describes the interfaces added to SCREENDD.