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        • ▼Virtual Device Drivers for MS-DOS Applications or Special Hardware
          • Virtual Device Drivers for MS-DOS Applications or Special Hardware
          • ▶How to Provide Virtual Device Support
          • Modifying an MS-DOS Application or 16-bit Driver
          • ▼Writing a VDD
            • Writing a VDD
            • Registering the Driver (Not Required for Application-Based Intercepts)
            • VDD Initialization
            • I/O Ports
            • ▼Memory-Mapped I/O
              • Memory-Mapped I/O
              • Memory Hooks
              • Including Upper Memory Blocks
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            • ▶DMA
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