
Code Ctrl+   Meaning of the VDU COMMANDS -

 0     @     Does nothing
 1     A     Sends next character to printer only
 2     B     Enable printer
 3     C     Disable printer
 4     D     Write text at text cursor
 5     E     Write text at graphics cursor
 6     F     Restores VDU drivers  (after being disabled by VDU 21)
 7     G     Generate bell sound
 8     H     Move cursor back one character  (= delete,in command input)
 9     I     Move cursor on by one character position
 10    J     Move cursor down one line
 11    K     Move cursor up one line
 12    L     Clear text viewport   (also cursors moved to home position)
 13    M     Move cursor to start of current line
 14    N     Turn on page mode
 15    O     Turn off page mode
 16    P     Clear graphics viewport
 17    Q     Define text colour         (VDU 17,n    = COLOUR n)
 18    R     Define graphics colour     (VDU 18,k,c  = GCOL k,c)
 19    S     Define logical colour      (VDU 19,logical,action,r,g,b)
 20    T     Restore the default logical colours
 21    U     Disable VDU drivers        (restored by VDU 6)
 22    V     Select screen mode         (VDU 22,mode)
 23    W     Multi-purpose command      (see pp.177 of BASIC Ref.Manual)
 24    X     Define graphics viewport   (VDU 24,left;bottom;right;top;)
 25    Y     PLOT                       (VDU 25,k,x;y;  = PLOT k,x,y)
 26    Z     Restore default viewports  (to full screen,+ home cursors)
 27    [     Does nothing
 28    \     Define text viewport       (VDU 28,l,b,r,t -columns and rows)
 29    ]     Define graphics origin     (VDU 29,x;y;  =  ORIGIN x,y)
 30    ^     Home text cursor           [ = PRINT TAB(0,0)]
 31    -     Move text cursor           [VDU 31,x,y  = PRINT TAB(x,y)]
