Virtual Devices (3.1) (vdag31qh.hlp) (Table of Contents; Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Block Device Services
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BlockDev_Command_Complete       Completes a command
BlockDev_Find_Int13_Drive       Returns block device descriptor
BlockDev_Get_Device_List        Returns block device descriptor list
BlockDev_Get_Version            Returns block device version
BlockDev_Register_Device        Registers a block device
BlockDev_Send_Command           Sends a command to a block device
BlockDev_Synchronous_Command    Sends synchronous commands
BlockDev_API_Hw_Detect_Start    Signals start of hardware detection
BlockDev_API_Hw_Detect_End      Signals end of hardware detection
BlockDev_API_Int13_Chain_Check  Signal that block device is about to load
BlockDev_Command_Block          Block device command information
BlockDev_Device_Descriptor      Information about a block device