VT200           ---+------+ +------+-------------+ +------+------+------+------+
CERN               |PF21  | | Help |             | |PF22  |PF23  |PF24  |PA3   |
D13270             |      | |******|             | |      |      |      |      |
keyboard        ---+------+ +------+-------------+ +------+------+------+------+
mapping
	       +---------+  +------+------+------+ +------+------+------+------+
tab = tab      |Backtab  |  |Erase |Toggle|Delete| |Erase |Clear |Toggle|Delete|
F6    PF13     |         |  |to EOF|insert|char  | |to EOF|screen|insert|char  |
 to =  to      +---------++ +------+-------------+ +------+------+------+------+
F14   PF21        |Enter  | |Next  |Back  |Clear | |PF1   |PF2   |PF3   |PA1   |
		  |       | |line  |tab   |screen| |      |      |      |      |
^g = Master       ++      | +------+------+------+ +------+------+------+------+
      reset        |      |        |Cursor|        |PF4   |PF5   |PF6   |PA2   |
^t = redraw        |      |        |up    |        |      |      |      |      |
      screen       +------+ +------+------+------+ +------+------+------+------+
			    |Cursor|Cursor|Cursor| |PF7   |PF8   |PF9   |PF12  |
			    |left  |down  |right | |      |      |      |      |
			    +------+------+------+ +-------+-----+------+      |
						   |PF10         |PF11  |      |
						   |             |      |      |
						   +------+------+------+------+
