  ,     ,     FPH511 .

  :   HDD,   80h    (   CF-    "creathdd". 
 ,   ve27a     ,  ,  ,    
 .
      CF-,  ,      80h  ""    .

       ...      ,      ...

,     HDD,      820 (839680 ).      830 (849920 ) - 
     ...

 .
1.  .    0h...3FFh
2.      FDD .     400h...CE7FFh.
  -  E5h,   - .
 :        A400h,     B400h.
3.    ( )        A000h   .
       .
  ()    785 (803840 ).
4.     HDD,  .
 :     CE800h,  CF800h,   192BFFh.
...
    192C00h.
 - 257000h.
 ..

,      80h.

    ,  ,   HDD   "creathdd"   ...

    2  ( 00  01)   401h  403h,       hdd  .
     ,  c fdd     .


          
.  55
----  ------  ------------------------------------------------------------------------
50h    A  |   16-: 50-.,58-..
58h    B  | ()  ()   
              +   :
       + >>  A  B  (),    
         + >> 01010000b --  
         + >> 10110000b --  
              + >> /  
         + >> 10010000b --  
-------------------------------------------------------------------------------
51h    A  | : Write Precompensation register.  Turn on write precompensation.
              +   :
       + >>  A    ,  B  
         + >> 10110001b --  
              + >>    A
         + >> 10010001b --  

51h    A  | :  .    .
              +   :
       + >>  A  B  ,    
         + >> 01010001b --  
              + >>    A
-------------------------------------------------------------------------------
52H    A  |      /
              +   :
       + >>  A  ,  B  ,    
         + >> 10110010b --  
              + >>    A
         + >> 10010010b --  
-------------------------------------------------------------------------------
53H    A  | /     /
              +   :
       + >>  A  ,  B  ,    
         + >> 10110011b --  
              + >>    A
         + >> 10010011b --  
-------------------------------------------------------------------------------
54H    A  | ,  ( 0-1 -   8-9 10-  )
              +   :
       + >>  A  ,  B  ,    
         + >> 10110100b --  
              + >>    A
         + >> 10010100b --  
-------------------------------------------------------------------------------
55H    A  | ,  ( 0-7 10-  )
              +   :
       + >>  A  ,  B  ,    
         + >> 10110101b --  
              + >>    A
         + >> 10010101b --  
-------------------------------------------------------------------------------
56H    A  |        /
              +   :
       + >>  A  ,  B  ,    
         + >> 10110110b --  
              + >>    A
         + >> 10010110b --  
-------------------------------------------------------------------------------
57H    A  | :   (. Tech Ref  )
              +   :
       + >>  A  ,  B  ,    
         + >> 10110111b --  
              + >>    A
         + >> 10010111b --  

57H    A  | :  
              +   :
       + >>  A  B  ,    
         + >> 01010111b --  
              + >>    A
-------------------------------------------------------------------------------
5fH    C  |   (  ,   57  
                  ).
              +   :
       + >>  A    ,    
         + >> xxx0xxxxb


 55 (..   ),  ,   ,  IDE (   C)    , 
       ,    ...

   55  ,        :
-  A -- D0-D7  IDE
-   -- D8-D16  IDE
-   0-C2 -- A0-A2  IDE
-   4 -- /RESET  IDE
-   5 -- /CS1FX  IDE
-   6 -- /DIOW  IDE
-   7 -- /DIOR  IDE

   ,            5Ch-5Fh,  55     
 IDE  C4.