CALL SVCTR(J) -- This subroutine will set the various
 terminal writing modes.  FCTR: SV
 
 Tektronix 4014.
   J = 1, Solid
       2, Dotted
       3, Dot-Dashed
       4, Short Dashed
       5, Long Dashed
 
 Note: To get De-Focused modes, add 5 to J; to get Write-Thru,
 add 10 to J.
 
 Tektronix 4025.
 
   J = -1, Erase line.
       0, Point at end of line.
     = 1, Solid.
     = 2, Dotted.
     = 3, Short dashed.
     = 4, Dot-Short Dashed.
     = 5, Short-Long Dashed.
     = 6, Three Dots-Long Dashed.
     = 7, Long Dashed.
     = 8, Three Short Dashes-Long Dashed.
 
 Note: These writing modes will stay in effect until the next change
 is requested ( or the next <CR> for a Tektronix 4014).