sys

  sys [[d:]path] d: [bootsect [BOTH]] [BOOTONLY] [switches]

Options

  [[d:]path]
  The (optional) location of the system files.
  If not given, the current directory is assumed.

  d:
  The drive to make bootable.

  bootsect
  The name of file, to which the 512-byte boot sector image
  will be written.
  (the drive's real boot sector won't be
   written to unless BOTH is used.)

  BOTH
  The new boot sector will be written to the image file
  and to the actual drive boot sector.

  BOOTONLY
  With this option the boot sector (or image) will be updated,
  but the kernel and command.com will
  not be copied to the destination.

Switches:

  /K filename
  Gives the filename of the kernel file to be copied. This option
  is only required when the kernel is not called "kernel.sys"

  /L segment
  The load segent, in hexadecimal, to use. The default is 60.