DEHL_Div_BC_special:
;DEHL/BC ==> DEHL
;Given that it should error if DE is non-zero and remainder is guaranteed 0.

;First, if DE>=BC, then the output will exceed 16 bits, so we should error
  ex de,hl
  xor a
  sbc hl,bc
  jr c,+_
  ld de,-1
  ret
_:
  add hl,bc

;Now enter into a normal DE/BC
  jp DE_Div_BC_continue