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

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

	pro  [frame spec]	# run main projector fwd or reverse
	pro2 [frame spec]	# run projector2

	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 >-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)

	Simply, this command will shoot frames on the projector. Negative
	numbers will shoot in reverse. A number indicates the number of
	frames to shoot.
	If the number of frames is preceded by a '>', this indicates that 
	the projector should 'goto' that frame number as shown on the 
	projector's counter. Values can also be specified as feet/frames 
	or as a mathematical expression (as shown above).

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

        The projector always tries to run 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.
	Hitting the ALLSTOP button, usually the (`) key, will halt the
	motors at the nearest frame. ALLSTOP is safe during shooting; 
	it does not affect exposure, and always leaves the shutter closed
	after stopping. The allstop key can be redefined by ALLSTOP(OPCSDEFS).

        The default 'big' frame counters (See BIGCOUNTERS(OPCSDEFS)) are
	limited to 6 digits. If a counter clocks above 999,999, or below
	-99,999, the display recycles to zero. This is only true of the 
	display..the software still keeps track of the real position.

	This is NOT the case if 'BIGCOUNTERS' is disabled; numbers in the 
	'small counter' display will not be clipped. Disable BIGCOUNTERS
	in the opcsdefs.opc if you need frame counts above 999,999.

        See COUNTER note above.

	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(OPCS)       - math expressions (for use in frame specifications)
        VELREP(OPCSDEFS) - special purpose velocities for tandem shoots (eg. YCM shooting)

	Gregory Ercolano, Los Feliz California 12/18/89
© Copyright 1997 Greg Ercolano. All rights reserved.