  Linux   Digital Alpha.   Digital Alpha
   RISC-   64-
 .        i386, 
  .   ,     -
 Alpha   ,    Alpha   -
     86.   ,
,  ,    .   
     ,     
  '.        -
 ,        ,   
    .

   Linux    i386,   
1.2   Digital Alpha, Intel x86, MIPS  SPARC,   
  .

    2.0     
Motorola 68k  PowerPC.        -
,      1.2,    -
.

   2.2       
:  ARM, IBM S/390  UltraSPARC.     
 2.4       , 
    15.     CRIS, IA-64,
64- MIPS, HP PA-RISC, 64- IBM S/390  Hitachi SH.

  2.6      
 20     Motorola 68k   MMU, H8/300, IBM
POWER, v850, x86-64   ,      
 Linux  Usermode Linux.  64- s390    32-
  s390,   .

 ,       
    .    
,   ARM  PowerPC,     -
   . ,   Linux    20  -
,        !

     

  (word)    ,   
   .     , -
   (character, 8 )  , ( ).   
 ,   16, 32  64.    "-" ,
        . ,  , 
 Intel Pentium   32- ,      -
  ,  32 ,  4 .

     .  -   ,   -
   !        
  .

                                                              391