## Display Device Driver Reference for OS/2

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### High-Level Design Decisions

There are three basic approaches that can be taken to adapt the S3 driver to another chip set. All of these approaches differ in how they handle the Shadow8514Regs. The Shadow8514Regs are shared by both the hardware- dependent code and the bit-map drawing code. The eddf_MESS() function relies on the fields in Shadow8514Regs, as well as the eddh_SrcDestBlt function.