PRO(OPCS)		Optical Printer Control System		PRO(OPCS)

    NAME
	pro  - run the projector so many frames forward or reverse
	pro2 - for two-headed printers, runs projector #2

    USAGE
	pro  [frame spec]   # run main projector fwd or reverse
	pro2 [frame spec]   # run aerial projector (projector2) fwd or reverse

    EXAMPLES
	pro 12            # run projector 12 frames forward
	pro -12           # run proj 12 frames in reverse
	pro 54'11         # run proj 54 feet 11 frames
	pro >0            # run proj TO counter frame zero
	pro >1200         # run proj TO counter frame 1200
	pro >-32          # run proj TO counter frame '-32'
	pro >34'8         # run proj TO counter '34 feet 8 frames'
	pro (sqrt(9)+1)   # run proj 4 frames (3+1)

   DESCRIPTION
	This command will shoot the specified frames on the projector.
	Negative numbers will shoot in reverse. So -100 will run the
	projector in reverse 100 frames.
	
	Values can also be specified as feet/frames (e.g. 2'15), or as
	a mathematical expression (as shown above).

	If the value is preceded by '>', this indicates the projector
	should "go to" the absolute projector frame counter value.

	For dual headed printers, the PRO2 command will run the second 
	projector. For compatibility there is a PRO1 command, which is
	the same as the PRO command.

    IMPORTANT NOTES
        OPCS always runs the projector at its fastest speed. See the
	SPD(OPCSDEFS) command for setting the projector's fast speed.

	Running the projector alone will have no effect on fades or dissolves,
	and the viewer may be open during projector runs without causing 
	'VIEWER OPEN' errors, allowing viewing scenes in motion.
	
    ALLSTOP
        Hitting the ALLSTOP key (usually the (`) key) will halt the motors
        at the nearest frame. ALLSTOP is safe during shooting; it will not
        affect exposure, and always leaves the shutter closed after stopping.
        The allstop key can be redefined by ALLSTOP(OPCSDEFS).

    COUNTER OVERFLOWS
        For more info on how counter overflows are handled, see CAM(OPCS).

    SEE ALSO
        PRO(OPCS)        - run frames on the projector (pro2 also)
        CAM(OPCS)        - run frames on the camera
        SEEK(OPCS)       - run the camera/projector at slewing speeds
        AUTOFILT(OPCS)   - enable/disable the auto-wedging filter wheel
        FEED(OPCS)       - feed motion control moves to motors every camera frame
        MATH(DOCS)       - math expressions (for use in frame specifications)
        SYNTAX(OPCS)     - Online calculator and OPCS math expression syntax
        VELREP(OPCSDEFS) - special purpose velocities for tandem shoots (eg. YCM shooting)

    ORIGIN
	Gregory Ercolano, Los Feliz California 12/18/89