This page lists all the device drivers in use. Some are internal to DOS,
and others are loaded with DEVICE= lines in CONFIG.SYS.

  The information shown is:
Device: The name of the driver, if given.
Units:  For a block device, the number of units inside of it.
Header: The address where the driver resides.
Attributes: There are 16 bits that define what the driver does. Numbering
            left to right, with left being 15:
            15: 1 = character device, 0 = block device
            14: 1 if IOCTL (special commands) are supported
            13: if a block device, then 1 means to use the boot sector to
                get information, 0 to use media ID byte.
                if a character device, then 1 means you can output till
                busy
            12: unused (0)
            11: 1 if open/close/removable media is supported
            10: unused (0)
            09: unused (0)
            08: unused (0)
            07: unused (0)
            06: 1 if generic IOCTL and get/set logical drive supported
            05: unused (0)
            04: 1 if the CON device, and fast output (Int 29h) supported
            03: 1 if the CLOCK$ device
            02: 1 if the NUL device
            01: if a block device, then 1 means 32-bit sectors supported
                if a character device, then 1 means it is standard output
            00: 1 if device is standard input

Strategy: This is the address used to setup a call.
Interrupt: The address called to execute a command.

Some common driver names:
EMMXXXX0: an EMS driver
XMMXXXX0: an XMS driver
\MMXXXX0: EMS driver disabled under Windows 3 (which supplies its own.)