1	SUB SMG_CHANGE_RENDITION(LONG Start_row,LONG Start_column,	&
		LONG Rows,LONG Columns,WORD Rendition,BYTE Vir_disp_num)

	!---------------------------------------------------------------&
	!								&
	!		     SMG_CHANGE_RENDITION			&
	!								&
	!		Creation Date:  3-July-1985			&
	!		Author:		Ken Messer			&
	! 		Purpose:        Change a virtual display's	&
	!				video rendition			&
	!								&
	!		Modification history				&
	!								&
	!	Date	Description of change(s)			&
	!								&
	!---------------------------------------------------------------&
	!								&
	! Copyright (c) 1985 -	Ken Messer, Allied Electronics, Inc.,	&
	!			401 E. 8th St., Ft. Worth, TX  76102	&
	!								&
	! This software may be copied and distributed freely to anyone	&
	! for non-commerical use provided that this copyright notice is &
	! included.							&
	!---------------------------------------------------------------&

	OPTION TYPE = INTEGER, SIZE = INTEGER LONG

	%include "SMG$LIBRARY:SMG.DFN"

	DECLARE LONG		RS,					&
				Rendition_set,				&
				Rendition_comp

	EXTERNAL LONG FUNCTION	SMG$Change_rendition

	EXTERNAL LONG CONSTANT	SMG$M_Blink,				&
				SMG$M_Bold,				&
				SMG$M_Reverse,				&
				SMG$M_Underline,			&
				SS$_Normal

	EXTERNAL STRING FUNCTION	Get_Error_Message(LONG)

	!---------------------------------------------------------------&
	!								&
	!		M a i n   P r o g r a m   L o g i c		&
	!								&
	!---------------------------------------------------------------&

	Rendition_set, Rendition_comp = 0

	! Test the rendition mask and set the specified video attributes

	Rendition_set = Rendition_set OR SMG$M_Blink	   IF Rendition AND 1
	Rendition_set = Rendition_set OR SMG$M_Bold	   IF Rendition AND 2
	Rendition_set = Rendition_set OR SMG$M_Reverse	   IF Rendition AND 4
	Rendition_set = Rendition_set OR SMG$M_Underline   IF Rendition AND 8

	Rendition_comp = Rendition_comp OR SMG$M_Blink	   IF Rendition AND 16
	Rendition_comp = Rendition_comp OR SMG$M_Bold	   IF Rendition AND 32
	Rendition_comp = Rendition_comp OR SMG$M_Reverse   IF Rendition AND 64
	Rendition_comp = Rendition_comp OR SMG$M_Underline IF Rendition AND 128

	! Call the SMG RTL routine to change the rendition

	RS = SMG$Change_rendition(Display_id(Vir_disp_num),Start_row,	&
		Start_column,Rows,Columns,Rendition_set,Rendition_comp)

	! Check for error

	IF RS AND SS$_Normal = 0   THEN
		PRINT Get_Error_Message(RS)
		STOP
	END IF

32767	SUBEXIT

	END SUB