graph TD
  open_gfx[Open the Graphics library]
  get_current_view[Get the current ActiView]
  load_view_null[LoadView NULL]
  waittof_twice[WaitTOF twice]
  store_old_copperlists[Store old Copperlists]
  get_cpu_type[Get CPU Type]
  68010_or_above{68010 or above?}
  get_010_vector_base_register[Get 010 Vector Base Register]
  return_0_for_vector_base_register[Return 0 for Vector Base Register]
  store_old_registers[Store old custom chip registers -- ADKCON, INTENA, DMA]
  wait_for_raster[Wait for end of raster beam]
  disable_and_clear_registers[Disable and clear registers -- Interrupts, DMA, INTREQ]
  install_custom_vertical_blank_interrupt_handler[Install custom vertical blank interrupt handler]
  set_up_new_dma_interrupts[Set up new DMA and interrupts]
  
  open_gfx --> get_current_view --> load_view_null --> waittof_twice
  waittof_twice --> store_old_copperlists --> get_cpu_type --> 68010_or_above
  68010_or_above -- yes --> get_010_vector_base_register
  68010_or_above -- no --> return_0_for_vector_base_register
  get_010_vector_base_register --> store_old_registers
  return_0_for_vector_base_register --> store_old_registers --> wait_for_raster --> disable_and_clear_registers --> install_custom_vertical_blank_interrupt_handler --> set_up_new_dma_interrupts