## Display Device Driver Reference for OS/2

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### Modifications to SCREENDD for IBM Japan

The following are the major modifications done for DBCS support. In the future, the code may be changed without notice.

A new IOCtl is added to allocate a BVHVGA2.DLL shadow buffer and DBCS font buffer in the global memory. There is no API that allocates the ring 3 global memory from the ring 3 program. By using this IOCtl, it is possible to get global memory for a ring 3 program.

The interface that maps the local memory to global and releases the global memory called from VDD are added. They are used for sharing the DBCS font resource between VFNTV.SYS and FNTCALLS.DLL.

The new IOCtl is added to access the ROM font in the DOS/V machine from ring 3 FNTCALLS.DLL.