DOS Device Drivers DOS Devices may be accessed by Int 21 Function calls which support file I/O by specifying the name of a device rather than a file or by useing the Handle Read and Write functions with the STDIN, STDOUT, and STDERR devices which are set to handles 0, 1, and 2 respectfully when dos loads any program. Some Device drivers also add new Interrupt Functions to the DOS or BIOS. Console Input and Output Clock device Physical Communication Drivers Logical Communication Device Physical Printer Logical Printer
BIOS Device Drivers Handle Close Int\21F\3E Handle Open Int\21f\3D Handle Read Int\21f\3F Handle Write Int\21f\40 IOCTL
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