![]() It also functions as a video validator to prevent such applications from issuing any sequence of instructions that would hang the machine. It provides support for full-screen MS-DOS applications to do I/O directly to the adapter registers. ![]() The system-supplied VGA display drivers use the support provided by VGA-compatible miniport drivers, so the developer of a new miniport driver for a VGA-compatible adapter need not write a new display driver. In most cases, it either is written for an adapter that has no VGA compatibility mode or for an accelerator that works independently of the VGA.Ī VGA-compatible miniport driver is based on the system-supplied VGA miniport driver, with code modified to support adapter-specific features. Instead, it is loaded along with a system-supplied VGA (or, possibly, with a VGA-compatible SVGA) miniport driver, which provides this support for full-screen MS-DOS applications. It provides no special support for full-screen MS-DOS applications in x86-based machines. Such a miniport driver is set up to configure itself in the registry with VgaCompatible set to zero (FALSE) and has the following features: NonVGA-compatible video miniport drivers rely on having the system-supplied VGA miniport driver (vga.sys) or another VGA-compatible SVGA miniport driver loaded concurrently. Most miniport drivers are nonVGA-compatible, and are consequently much simpler to implement. ![]() On x86-based NT-based operating system platforms, there are two kinds of video miniport drivers: nonVGA-compatible miniport drivers and VGA-compatible miniport drivers. ![]()
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