PSE(OPCS)		Optical Printer Control System		PSE(OPCS)

    NAME
        pse - pause a run script

    USAGE
        pse [-noabort] [-nodeb]

    DESCRIPTION
        This command will pause a running script to allow users to adjust
	filters, f-stops, and the like. This command simply prompts the 
	operator with a 'Hit RETURN to continue' prompt.
	
	If the -noabort argument is specified, the user will not be able 
	to hit 'allstop' to abort the PSE command, which can be used to prevent
	accidental ALLSTOPs made by the operator in such scripts as LOAD and 
	LINEUP (which pause with a device out of phase).
	
	If the -nodeb argument is specified, the default keyboard
	debouncing is /disabled/. Debounce is the default, which prevents
	a user from holding down ENTER from a previous command to quickly
	pass through the 'pse' prompt (due to typematic repeat).

	For instance, to shoot a 12x wedge of a single projector frame,
	PSE can be used to pause before shooting each frame:

	    do 12 pse cam 1  # Wedging commands

	The above will shoot 12x frames, prompting the operator before
	shooting each frame with:

		* PAUSE *
		RETURN to continue, or SPACEBAR to abort:

	..allowing the operator to change filters, and hit return to shoot
	each frame. (With a filter wheel, of course, one doesn't need to
	do this)

	To prompt for special filters each frame, make a 'wedge.run' script:

	     ! echo Load ND-2 ! pse cam 1
	     ! echo Load ND-4 ! pse cam 1
	     ! echo Load ND-8 ! pse cam 1
	     [..etc..]

        This way the camera operator will see a prompt for each filter
	to load.

    NOTES
        Whenever PSE is encountered, the keyboard's buffer is CLEARED of any
	previous characters to prevent accidentally typed characters from
	skipping several PSE commands.

    SEE ALSO
        RUN(OPCS) - execute a run script

    ORIGIN
	Gregory Ercolano, Los Feliz California 04-23-91