SHOW   display control on color monitor

	This describes the task SHO (show) which is used to control the display output. SHO can be used with the
indirect command file processor to build powerful image processing codes.
SHO can be used in conjunction with the AT. processor to create movie loops,
, demonstration packages or production image manipulation
programs. If the users system supports luanching of tasks from within
tasks, SHO can be used to control displays from within a 
Fortran or assembly language program.

	This version is for Comtal Vision 1 displays and supports most
special features thru various switches.

	SHO is an installed task that is invoked with SHO<cr>  or
	 SHO /switches<cr>.

	The SHO (show) task sets the display that appears
on the users display screen. It does not manipulate data ,
it only determines what will be output on the CRT.

	The SHO & IMG tasks can be used to gether in image processing tasks
	to manipulate(IMG) and display(SHO) the data. They can both be used
	to run movie loops or provide self pacing demonstrations.

 NOTE:The graphics,images,and function memories are referred to differently
	in SHO than they are in the companion program IMG. SHO uses switches
	to control the Comtal output mux and does no data xfers, IMG does
	data xfers and does not control the output mux. The logical device
	names used in IMG ,ie IM1:,GR1:,FM1: are handled by RSX-11M
	the switch designations used in SHO are IM:1,GR:1,FM these are
	slightly different but important differneces. Originally IMG & SHO
	were one task but I needed switches for image xfers and removed the
	SHO functions because it didnt fit well. The SHO is tied to Comtal
	while the IMG code is not and has more potential for portability.

/GR:n		Legal range of n with Comtal is 1 to 4. Default if
		none specified is 1. ,ie. /GR   =  /GR:1
		If negated then that graphics overlay is removed
		from the current display.
	output only =add the graphics memory n as an overlay on the
		current display.
		/-GR:n delete the named graphics from the current display


/IM:n:m:o	output only=set the display to show the contents of image memory
	n. If m is also given display both images split screen 
	vertically. If switch is negated split screen horizontally.
		If :o is given then use all 3 image memories for a true
	color presentation assign n to Green, m to Red, o to Blue.

/FM	output only=add function memory processing to current
	displayed image. If negative remove function memory
	processing from current image.

/CM	output only=add the color memory processing to current 
	displayed image. If negative remove color memory
	processing from current image.

/TP:n	Test Pattern ,sets Comtal to display its test pattern using n
	as the pattern to display.
	output only=
	n=0 for blank screen
	n=1 for grey scale
	n=2 for dots
	n=3 for bars


/AN:n	ANnotation field on Comtal screen is contorlled by value of n.
	output only=
	n=0 annotation characters
	n=1 grey scale
	n=2 function memory processed color
	n=3 color processed

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EXAMPLES:
SHO>/IM:1			show image 1 at color monitor

SH0>/TP:0			;display black screen on monitor

SHO>/IM:1/CM/FM			;display image 1 with both function
				;memory and color processing

SHO>/GR:2			;add graphics overlay #2 to the current
				;display

SHO>/IM:1:2			;display images 1 & 2 split screen vertically

SHO>/AN:1			;replace characters with annotation grey 
				;scale

SHO>/-GR:3/-CM			;remove graphics overlay 3 from display
				;and discontinue functon memory processing
				;the current image
SHO>TP:0			;display black screen
SHO>/GR:1			;add graphics 1
SHO>/GR:2			;add graphics 2

SHO>/TP:1			;display greay scale 
SHO>/CM				;add color memory processing
				;this displays the color table

SHO>/TP:1/FM			;display function memory 1

end of show documentation.