ng of register\n  i := fontlib-fontheight-4\n  save v0\n  i := fontlib-fontheight-5\n  save v0\n\n  # Update these subtractions\n  v1 := v0\n  v0 := 0\n  v0 -= v1\n    i := fontlib-fontheight-1\n    save v0\n  i := fontlib-fontheight-2\n  save v0\n\n  # Update sprite opcode\n  i := fontlib-fontheight-3\n  load v0\n  vF := 0xF0\n  v0 &= vF\n  v0 |= v1\n  i := fontlib-fontheight-3\n  save v0\n  return\n\n\n# Inputs:\n#   * v0 - v1  ->  0xANNN where NNN is pointer to string (or 0xNNNN for XO-CHIP)\n#   * v2   