7.2.4. Direct Page Addressing

Since all of the addressing modes indicated in Table 7.2.4 are
applicable to the data of the direct page (P=0: addresses 
0000-00FF P=1: address 0000 - 01FF) designated by the direct page
(P) flag. it is possible to manipulate the data in various ways.
In additon byte efficiency also improves due to the fact that
direct address designation is possible by one-byte data within
the command words. Moreover, since effective commad cycles also
decrease data can be accessed more rapidly.


        Table 7.2.4. Memory Access Addressing Effective Address

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                                        #of   Effective Addr. Region
Simbol  |    Addressing    
                                        Bytes  0000-01FF  1FFF  1FFF
--------------------------------------------------------------------
  dp       Direct Page                    2        X        X

  dp+X     X-Indexed Direct Page          2        X        X

  dp+Y     Y-Indexed Direct Page          2        X        X

  (X)      Indirect                       1        X        X

  (X)+     Indirect Auto-increment        1        X        X

  dp,dp    Direct Page to D.P.            3        X        X

  (X),(Y)  Indirect Page to I.P.          1        X        X

  dp Inm   Inmediate Data to D.P.         3        X        X

  dp, bit  Direct Page Bit                2        X        X

dp,bit,rel Direct Page Bit Relative       3        X        X

 mem, bit  Absolute Boolean Bit           3        X        X     
                                                   
   labs    Absolute                       3        X        X     X

  labs+X   X-indexed Absolute             3        X        X     X

  labs+Y   Y-indexed Absolute             3        X        X     X

  (dp+X)   X-indexed Indirect             2        X        X     X

  (dp)+Y   Indirect Y-indexed Indirect    2        X        X     X

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