1 FORMAT
          [GTVDEF\]FORMAT [format]

     FORMAT selects a format to specify and list the character strings
that  define  the  escape  sequences.   Available formats are DECIMAL,
HEXADECIMAL and ASCII.

     1.  Decimal format is in the form "<d1><d2>..." where d1,  d2,...
         are decimal unsigned byte values enclosed in brackets

     2.  Hexadecimal format is in the  form  "<h1><h2>..."  where  h1,
         h2,...   are  hexadecimal  unsigned  byte  values enclosed in
         brackets

     3.  Ascii format is in the form "c1c2..." where c1,  c2,...   are
         either ordinary ascii characters (SIC separators and brackets
         excluded)  or  decimal  unsigned  byte  values  enclosed   in
         brackets  (as  for  decimal  format)  or  usual mnemonics for
         control characters enclosed in brackets (such as <ESC>, <US>,
         etc...)


     To list or modify the format, just enter FORMAT with no argument.
The  current  format is returned with an error condition, and the line
keypad editing mode of SIC is triggered.

     Escape  sequences  are  always  preceded  by  a   decimal   count
corresponding  to  the number of bytes of the string.  A count -1 or 0
suppresses the escape sequence.  By convention, a count  value  of  -1
generally  means  that the corresponding action is not available (e.g.
ALPHA, GRAPHIC if no alpha plane is available, CURS1 if no  cursor  is
available,  etc...),  and  0  means  that  the corresponding action is
available but is managed internally for the current protocol.

     To list or modify an escape sequence, just enter  the  associated
command  with  no  argument.  The current sequence is returned with an
error condition, and the line keypad editing mode of SIC is triggered.
1 Language
                    PARAMS Language Summary

FORMAT          : Select a format to specify and list escape sequences
DEFOUT          : Default logical name pointing to the terminal device
PROTOCOL        : Graphic protocol supported by the terminal
PROTECT         : Screen protection 
INIT1           : Initialisation sequence (GTOPEN)
INIT2           : Reset sequence (GTCLOS)
PIXEL_RANGE     : Limits of the screen in pixels
RXY             : Aspect ratio of the screen
ERASE           : Sequence to clear the graphic screen
WAIT_ERASE      : Specify a wait time after ERASE
ALPHA           : Sequence to toggle into VT100-like alpha plane
GRAPHIC         : Sequence to toggle to graphic plane
CURS1           : Sequence to request the graphic cursor
CURS2           : Sequence to reset the terminal when the cursor has exited
CURS_ECHO       : Toggle echoing ON/OFF when accessing the cursor
COLOUR          : Sequence(s) to select colours
DASH            : Sequence(s) to select hardware dashed lines
WEIGHT          : Sequence(s) to select hardware weightened lines
XYWEIGHT        : Offsets for weightened lines (pixels)
DELETE1         : Sequence to toggle to line erase mode (black writing)
DELETE2         : Sequence to return to normal operation
TEXT1           : Sequence to initiate a hardware character generator
TEXT2           : Sequence to terminate hardware characters
PHEIGHT         : Height of hardware characters (pixels)
PWIDTH          : Width of hardware characters (pixels)
XYTEXT          : Offsets for hardware characters (pixels)
POINT1          : Sequence(s) to select hardware markers
POINT2          : Sequence(s) to terminate hardware markers
FILL            : Sequence to fill an area
VALUE           : Sequence to pick a colour value in a filled area
2 NEWS

     See HELP GTVDEF NEWS
