#
#	VT100 VIDEO DISPLAY COMMAND PROGRAM. CALLING SEQUENCE IS
#	CALL UVT100(CMD,N1,N2), WHERE CMD IS ONE OF THE COMMANDS IN
#	THE PARAMETER LIST BELOW, AND N1 AND N2 ARE OPTIONAL PARAMETERS
#	DEPENDING UPON CMD. SEE THE UVT100 USER'S MANUAL FOR MORE DETAILS.
#
#	AUTHOR:	GLEN HOFFING
#	DATE:	24-FEB-81
#
	SUBROUTINE UVT100(CMD,N1,N2)
	IMPLICIT INTEGER (A-Z)
	BYTE OUTBUF(1000)
	COMMON /VTCOM/ OUTBUF,LEN
	PARAMETER CUP = 1,		#CURSOR POSITION REPORT
	  CUU = 2,			#CURSOR UP
	  CUD = 3,			#CURSOR DOWN
	  CUF = 4,			#CURSOR FORWARD
	  CUB = 5,			#CURSOR BACK
	  DECDWL = 6,			#DOUBLE WIDTH LINE
	  DECDHL = 7,			#DOUBLE HEIGHT LINE
	  DECRC = 8,			#RESTORE CURSOR
	  DECSC = 9,			#SAVE CURSOR
	  DECSWL = 10,			#SINGLE HEIGHT, SINGLE WIDTH LINE
	  ED = 11,			#ERASE IN DISPLAY
	  EL = 12,			#ERASE IN LINE
	  SGR = 13,			#SELECT GRAPHIC RENDITION
	  NEL = 14,			#NEXT LINE
	  SCS = 15,			#SELECT CHARACTER SET
	  SM = 16,			#SET MODE
	  RM = 17,			#RESET MODE
	  ANSI = 18			#SET TERMINAL TO VT100 MODE (VT52 CMD)
	OUTBUF(LEN+1) = 27		#SET FIRST CHARACTER TO 'ESCAPE' CODE

	IF (CMD == CUP) [		#CURSOR POSITION
	  OUTBUF(LEN+2) = "["
	  IF (N1 < 1 .OR. N1 > 24)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+3)) N1	#...ROW N1
	  IF (OUTBUF(LEN+3) == " ")
	    OUTBUF(LEN+3) = 0
	  OUTBUF(LEN+5) = ";"
	  IF (N2 < 1 .OR. N2 > 80)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+6)) N2	#...COLUMN N2
	  IF (OUTBUF(LEN+6) == " ")
	    OUTBUF(LEN+6) = 0
	  OUTBUF(LEN+8) = "H"
	  LEN = LEN + 8
	  ]

	ELSE IF (CMD == CUB) [		#CURSOR BACK
	  OUTBUF(LEN+2) = "["
	  IF (N1 < 1 .OR. N1 > 80)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+3)) N1	#...N1 COLUMNS
	  IF (OUTBUF(LEN+3) == " ")
	    OUTBUF(LEN+3) = 0
	  OUTBUF(LEN+5) = "D"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == CUD) [		#CURSOR DOWN
	  OUTBUF(LEN+2) = "["
	  IF (N1 < 1 .OR. N1 > 24)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+3)) N1	#...N1 ROWS
	  IF (OUTBUF(LEN+3) == " ")
	    OUTBUF(LEN+3) = 0
	  OUTBUF(LEN+5) = "B"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == CUF) [		#CURSOR FORWARD
	  OUTBUF(LEN+2) = "["
	  IF (N1 < 1 .OR. N1 > 80)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+3)) N1	#...N1 COLUMNS
	  IF (OUTBUF(LEN+3) == " ")
	    OUTBUF(LEN+3) = 0
	  OUTBUF(LEN+5) = "C"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == CUU) [		#CURSOR UP
	  OUTBUF(LEN+2) = "["
	  IF (N1 < 1 .OR. N1 > 24)
	    RETURN
	  ENCODE(2,10,OUTBUF(LEN+3)) N1	#...N1 ROWS
	  IF (OUTBUF(LEN+3) == " ")
	    OUTBUF(LEN+3) = 0
	  OUTBUF(LEN+5) = "A"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == DECDHL) [	#DOUBLE-HEIGHT LINE
	  OUTBUF(LEN+2) = "#"
	  IF (N1 == 1)
	    OUTBUF(LEN+3) = "4"		#...BOTTOM HALF	
	  ELSE
	    OUTBUF(LEN+3) = "3"		#...TOP HALF
	  LEN = LEN + 3
	  ]

	ELSE IF (CMD == DECDWL) [	#DOUBLE-WIDTH LINE
	  OUTBUF(LEN+2) = "#"
	  OUTBUF(LEN+3) = "6"
	  LEN = LEN + 3
	  ]

	ELSE IF (CMD == DECRC) [	#RESTORE CURSOR
	  OUTBUF(LEN+2) = "8"
	  LEN = LEN + 2
	  ]

	ELSE IF (CMD == DECSC) [	#SAVE CURSOR
	  OUTBUF(LEN+2) = "7"
	  LEN = LEN + 2
	  ]

	ELSE IF (CMD == DECSWL) [	#SINGLE-WIDTH,SINGLE-HEIGHT LINE
	  OUTBUF(LEN+2) = "#"
	  OUTBUF(LEN+3) = "5"
	  LEN = LEN + 3
	  ]

	ELSE IF (CMD == ED) [		#ERASE DISPLAY
	  OUTBUF(LEN+2) = "["
	  IF (N1 == 0)			#...CURSOR POSITION TO END OF SCREEN
	    OUTBUF(LEN+3) = "0"
	  ELSE IF (N1 == 1)		#...START OF SCREEN TO CURSOR POSITION
	    OUTBUF(LEN+3) = "1"
	  ELSE
	    OUTBUF(LEN+3) = "2"		#...ENTIRE SCREEN
	  OUTBUF(LEN+4) = "J"
	  LEN = LEN + 4
	  ]

	ELSE IF (CMD == EL) [		#ERASE LINE
	  OUTBUF(LEN+2) = "["
	  IF (N1 == 0)			#...CURSOR POSITION TO END OF LINE
	    OUTBUF(LEN+3) = "0"
	  ELSE IF (N1 == 2)		#...ENTIRE LINE
	    OUTBUF(LEN+3) = "2"
	  ELSE				#...START OF LINE TO CURSOR POSITION
	    OUTBUF(LEN+3) = "1"
	  OUTBUF(LEN+4) = "K"
	  LEN = LEN + 4
	  ]

	ELSE IF (CMD == SGR) [		#SELECT GRAPHIC RENDITION
	  OUTBUF(LEN+2) = "["
	  IF (N1 == 7)			#...REVERSE FIELD ON
	    OUTBUF(LEN+3) = "7"
	  ELSE
	    OUTBUF(LEN+3) = "0"		#...REVERSE FIELD OFF
	  OUTBUF(LEN+4) = "m"
	  OUTBUF(LEN+5) = 8
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == NEL) [		#CURSOR TO NEW LINE
	  OUTBUF(LEN+2) = "E"
	  LEN = LEN + 2
	  ]

	ELSE IF (CMD == SCS) [		#SELECT CHARACTER SET
	  IF (N1 == 0)			#...G0 CHARACTER SET
	    OUTBUF(LEN+2) = "("
	  ELSE				#...G1 CHARACTER SET
	    OUTBUF(LEN+2) = ")"
	  IF (N2 == 0)			#...UNITED KINGDOM CHARACTER SET
	    OUTBUF(LEN+3) = "A"
	  ELSE IF (N2 == 1)		#...ASCII CHARACTER SET
	    OUTBUF(LEN+3) = "B"
	  ELSE				#...SPECIAL GRAPHICS SET
	    OUTBUF(LEN+3) = "0"
	  LEN = LEN + 3
	  ]

	ELSE IF (CMD == SM) [		#SET MODE
	  OUTBUF(LEN+2) = "["
	  OUTBUF(LEN+3) = "?"
	  IF (N1 > 0 .AND. N1 < 10)	#...MODE TO SET
	    ENCODE(1,5,OUTBUF(LEN+4)) N1
	  OUTBUF(LEN+5) = "h"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == RM) [		#RESET MODE
	  OUTBUF(LEN+2) = "["
	  OUTBUF(LEN+3) = "?"
	  IF (N1 > 0 .AND. N1 < 10)	#...MODE TO RESET
	    ENCODE(1,5,OUTBUF(LEN+4)) N1
	  OUTBUF(LEN+5) = "l"
	  LEN = LEN + 5
	  ]

	ELSE IF (CMD == ANSI) [		#ANSI MODE
	  OUTBUF(LEN+2) = "<"
	  LEN = LEN + 2
	  ]

  5	FORMAT (I1)
 10	FORMAT (I2)
	RETURN
	END