This vector (at 0:0060) has the entry point for the ROM-BASIC interpreter
 which is found only on IBM-logoed computers.  Clones do not have BASIC in
 ROM and must use a separate program, usually QBASIC or GWBASIC.

 If ROM-BIOS could not get a disk to boot, it takes this vector.  This
 makes it possible for a ROM-Scan external ROM module to alter this vector
 to point to itself, thus giving itself control if the disks fail or are
 not present.

See Also: ROM-BIOS Functions
          BIOS Data Area