- volatile u8 control;
- volatile u8 status;
- volatile u8 cursor_start;
- volatile u8 cursor_end;
- volatile u8 h_blank_start;
- volatile u8 h_blank_end;
- volatile u8 h_sync_start;
- volatile u8 h_sync_end;
- volatile u8 comp_sync_end;
- volatile u8 v_blank_start_high;
- volatile u8 v_blank_start_low;
- volatile u8 v_blank_end;
- volatile u8 v_sync_start;
- volatile u8 v_sync_end;
- volatile u8 xfer_holdoff_start;
- volatile u8 xfer_holdoff_end;