Int E0 Fn 0022  - Pcrobots V1.41 - "invisibility" - Control Robot's Invis  [g]

   AX = 0022h
   BX = new state (0000h become visible, 0001h become invisible)

Return: nothing

Notes: this function has no effect if the robot is not capable of invisibility
   the robot can only stay invisible for 100 turns, after which it will
     automatically become visible; it must also be remain visible for
     as many turns as it was invisible before it can turn invisible
     again

See Also: AX=0024h,AX=0080h