Function            getBootBlock4 - get Boot Block under DOS 4.x.

  Syntax              boolean getBootBlock4(int drive, struct BootBlock4
                                           *BB4)

  Prototype in        doshk.h

  Remarks             gets the Boot Block for the disk determined by
                      drive, where 0=A, 1=B, etc. BB must be a pointer to
                      an allocated piece of memory. This function only
                      works for DOS versions 4.x and later.

  Return value        returns TRUE if successful, otherwise returns FALSE
                      with the DOS error code in the global variable
                      errno.

  See also            getBootBlock(), getBPB(), getVolSerialNum()

  Example             #include <doshk.h>

                      main()
                      {
                           struct BootBlock4 BB4;

                           if (getBootBlock4(0,&BPB4))
                                printf("Got it");
                           else
                                printf("Error");
                      }