parallel man page on Xenix

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     PARALLEL(HW)	      XENIX System V		  PARALLEL(HW)

     Name
	  parallel - Parallel interface devices.

     Description
	  There are several parallel devices:

	  /dev/lp0  Main parallel adapter.

	  /dev/lp1  Adapter on monochrome video card.

	  /dev/lp2  Alternate parallel adapter (on appropriate
		    machines).

	  It is not possible to have all three parallel devices on one
	  system.  XT computers only allow the use of /dev/lp0. Some
	  AT computers allow the use of two parallel devices,
	  /dev/lp0, and either /dev/lp1, or /dev/lp2.

	  If a parallel device fails to interrupt properly, the
	  parallel driver enters ``poll mode.'' Once interrupts are
	  received from the device, the driver returns to its original
	  mode.

	  The parallel driver delays a certain amount of time when a
	  parallel device is closed.  The amount of delay can affect
	  printer performance, but is necessary to compensate for
	  different sizes of printer buffers and printer speeds.  For
	  example, this command sets the delay on close to 1 second,
	  specified in 10ths of a second by Ctrl-J (ASCII value 10):

	       stty eol "^J" < /dev/lp0

	  The default delay value is 2 seconds (^T).

     Notes
	  Parallel adapters on add-on cards will function, but
	  switches must be set correctly.  Some compatable computers
	  have ports lp0 and lp1 reversed.

	  The stty(C) command for output processing is supported on a
	  parallel device.  stty options that have no effect on a
	  parallel device are ignored and no error messages are
	  displayed.

     Usage
	  Usually invoked by through lp(C), but can be written to
	  directly.

     Files
	  /dev/lp0
	  /dev/lp1
	  /dev/lp2

     Page 1					      (printed 8/7/87)

     PARALLEL(HW)	      XENIX System V		  PARALLEL(HW)

     See Also
	  lp(C), lp(HW), lpadmin(C), lpinit(C), lpsched(C), serial(HW)

     Page 2					      (printed 8/7/87)

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