Grammer Add Float Mode

Add:
  push bc
  bit floatmode,(iy+ModeFlags2)
  jr nz,float_add
  ld a,(hl)
  cp 3Ah
  jr z,+_
  call ParseFullArg
  pop hl
  xor a
  add hl,bc
  ld b,h
  ld c,l
  ld h,a
  adc a,a
  ld l,a
  ld (ThetaPrimeVar),hl
  ret
float_add:
  dec hl
  ld (parsePtr),hl
_:
  ld hl,addSingle
  jp float_stepin