absolute indirect addressing的用法和样例：
- Indirect addressing for periodic grids.
- The absolute address at the beginning of any area of storage to which reference is made when indirect addressing methods are used to locate items in the storage area.
- After that,other program also can access the expansion ROM in I/O address space by register indirect addressing.
- Indirect address A location that contains the address of the data rather than the data itself. See Address.
- The Indexed Indirect Addressing mode, for instance, permits look-up tables to be located anywhere in the address space, thus enabling very flexible programming and compact C-based code.