turbo_mode_ON =: {{
  assert. 0 <: c =. 8 - {: $y
  h =. (3 (3!:4) 16be2), ,|."1 [3 (3!:4)"0 (4:,#,1:,#) y
  3!:2 h, ,y ,"1 _ c # ' '
}}

turbo_mode_OFF =: {{
  (5& }. @: (_8& (]\)) @: (2& (3!:1))) &.> y
}}