## Display Device Driver Reference for OS/2

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### HWACCESS.ASM

The routines in HWACCESS.ASM are among the most heavily used code in the driver. They are responsible for setting up key hardware values, copying data to or from off-screen VRAM, and resetting the hardware. The purpose of this section is to describe each routine, and where and how it is used. When adapting the S3 driver to another chip set, it is likely that one or more of these routines will have to be modified. Entirely new routines might need to be created to augment or even replace some of the ones mentioned.