
     18.  
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    ⥬ প ૥  (   ४-
ﬨ)    ᮧ ணࠬ,  ࠧ  -
⥫쭮 ॢ室 稭 ⨢  設. ᭮
ਭ樯  ⮨  ⮬,  ⮡ ꥤ ᪮쪮 ணࠬ
(楤  㭪権)    ᪮쪨 䠩 ⤥쭮  
䠩  ணࠬ  ⥬, ⮡ ᫥⢨ ⮬᪨
㦠  䠩      ᠬ  .

    .18-1  ணࠬ,    ᯮ  
૥ 䠩   ૥묨 ணࠬ,  ᮡ࠭묨
   .   ணࠬ ࠧ   
     ணࠬ.


      ணࠬ                     ૥ 䠩

  Ŀ
                                   Ŀ
     ணࠬ       Ĵ ૥ 楤 1 
                                                          
  Ĵ         Ĵ
                                                    
                         Ĵ                        
    ૥    Ŀ    ૥ 楤 2 
                         Ŀ                            
                         Ŀ                             
  Ĵ       Ĵ
                             Ĵ ૥ 楤 3 
                                                         
                                 Ĵ
                            Ĵ ૥ 楤 4 
     ணࠬ                                  
                                  Ĵ
                           Ĵ ૥ 楤 5 
                                   
                         
  


            .18-1. ਭ樯 ૥ 


     뢠 ૥  楤,    ⮬᪨
㦠    ,  १ࢨ஢  
ணࠬ.  ஬⮪   筮 訬, -
  ᠬ 让  ૥,  室   -
 㯯.   ࠧ,  , ॡ㥬  ண-
ࠬ, 㬥蠥  ਡ⥫쭮  㬬 ࠧ஢  -
ணࠬ  ૥ 㯯  ⮬ ࠧ ᠬ -
让   ணࠬ.

     ᫥  ਬ  ૥ 楤 2  ᠬ
让    楤,  ⮬     ।
ࠧ ૥     ணࠬ.  -
    楤   ૥ .

    ணࠬ 襣 ࠧ 㦠    ᠬ -
, 祬    稭 (᫥ 㧪)  ᠬ-
 ࢮ  ૥ . ⮪ ૥ -
  ᯮ.

    ᪮ 楤  1,3,4   5 믮  ⮬  ,
  楤 2,   ,     ॡ  -
⥫쭮    ணࠬ.  祢,   
  楤    뢠     ⮩  
૥ 㯯,  ᪮      -
 ६.

      㯯 ૥    ࠧ  -
 楤;   ⢨⥫쭮, 㬬 ࠧ ૥-
 楤  ⥫쭮 ॢ ࠧ    ண-
ࠬ.  ⥬  ,    ணࠬ  ࠢ ॡ-
  ⮫쪮 ⨢ ,  ᪮쪮    ᠬ
  .

    ,  ਤ    ⥫ 
  ணࠬ,  ⮨  ⮬,  ࠡ ணࠬ -
  ६, ॡ㥬  㧪  楤  -
.  襬 ஢ ૥  প    
७० 묨.


     ૥
    =================

    ૥ ணࠬ ᮧ ⮬᪨ -  ⮣
㦭    ᠭ   楤    㭪樨
᫮ OVERLAY.

ਬ:
--------

    overlay procedure Initialize;
    overlay function TimeOfDay: Time;

    ⨢ ⠪ ᠭ,  ४頥 뢮 
  䠩,   ⮣ 뢮   ⤥ ૥-
 䠩.  ⮣ 䠩 㤥 ⠪ ,    䠩 -
 ணࠬ,    ⨯ 㤥 , 騩 -
 㯯 - ᫮  000  999.

    ᫥⥫쭮 ᯮ ૥ ணࠬ -
 .   砥,   ૥ ணࠬ,
 묨   㣨 , ਭ  -
 㯯     ૥ 䠩.

ਬ 1.
---------

    overlay procedure One;
    begin
      :
      :
    end;

    overlay procedure Two;
    begin
      :
      :
    end;

    overlay procedure Three;
    begin
      :
      :
    end;


      ૥ 楤  㯯஢    
饭   ૥ 䠩. ᫨ 祭 㯯 -
 ࢮ ૥ 㯯   ணࠬ,   ૥
䠩   .000 .

     ૥  楤  ᫥饣 ਬ  -
饭  ᫥⥫ ૥ 䠩 .000  .001 , ᪮-
 ૥  楤  Two  Three ࠧ  -
૥ 楤 Count.

     ⢥ ࠧ饣     ᯮ짮
 .   ਬ,    ਭ㤨⥫쭮  ࠧ
૥ ⥩    ᯮ짮  䨪⨢  
TYPE.


ਬ 2.
---------

    overlay procedure One;
    begin
      :
      :
    end;

    overlay procedure Two;
    begin
      :
      :
    end;

    procedure Count;
    begin
      :
      :
    end;

    overlay procedure Three;
    begin
      :
      :
    end;


      ૥ 㯯     ணࠬ  -
ࢨ ⤥쭠 ; ஬ ⮣,  ᮧ ᫥-
騥 䠩: FILE.000  FILE.001 (. .18-2).


      ணࠬ                    ૥ 䠩

  Ŀ
                         
     ணࠬ                    FILE.000
                                   Ŀ
  ĴĴ ૥ 楤 1 
   ૥  0  ô         Ĵ
  ĴĴ ૥ 楤 2 
   楤 Count                 
                                            FILE.001
  Ĵ          Ŀ
   ૥  1  Ĵ ૥ 楤 3 
  Ĵ          
     ணࠬ 
                         
  


            .18-2. ᪮쪮 ૥ 䠩.



     ૥ 
    ==============================

    ૥ ணࠬ    묨,  ..  
૥ ணࠬ    ᮤঠ    ᥡ  
૥ ணࠬ,  ᠬ ᮤন ૥ -
ணࠬ  ..


ਬ 3.
---------

    program OverlayDemo;
      :
      :
    overlay procedure One;
    begin
      :
      :
    end;

    overlay procedure Two;
      overlay procedure Three;
      begin
        :
        :
      end;
    begin
      :
    end;


     ⮬ ਬ  ᮧ  ૥ 䠩. FILE.000
ᮤন ૥ 楤 One  Two,     ணࠬ
㤥 १ࢨ஢ ,  筠  饭 -
쭮   .  ૥  䠩 FILE.001 ᮤন ૥
楤 Three,     쭮    ⭮襭  
૥ 楤  Two,  ⠪   ૥   
ᮧ   ૥ 楤 Two (..18-3).


    ணࠬ                ૥ 䠩

Ŀ
   ணࠬ         FILE.000
Ĵ    Ŀ
                        Ĵ ..1 
                         Ĵ
 ૥     Ŀ ڴ ..2       FILE.001
                         Ĵ  Ŀ
                        Ĵ .Ĵ ..3 
Ĵ   Ĵ  
   ணࠬ      .2   
    


             .18-3.  ૥ 䠩.




    ⮬᪮ ࠢ ૥ﬨ
    ===================================

    ૥ ணࠬ 㦠   ⮫쪮  ⮣,
    ந室 饭 (..    맮).  
 맮 ૥ ணࠬ ⥬ ० ᥣ -
,     㦥 ᥩ  ணࠬ  -
 .  ᫨ ணࠬ  ૥  -
,   믮  ⮬᪮ 뢠 ⮩ ண-
ࠬ  ᮮ⢥饣 ૥ 䠩.


    饭 ૥ 䠩
    ============================

     ६ 樨 ૥ 䠩 ࠧ  ⥪饬
᪮, ..    ⮬  ᪮,   ᯮ 
ணࠬ 䠩 (.COM).

     ६ 믮 ⥬ 筮 ।,   -
 䠩 ⠪ 室  ⥪饬 ᪮.   -
 ⮩ ⠭  ᯮ짮 楤ன OVRDRIVE.

    ⠪: OVRDRIVE(Disk);

     Disk - 楫 ࠦ,  饥 ᪮ (0 - ⥪-
騩, 1 - ᪮ A: , 2- B:  ..).  ᫥ 饭-
  ૥ 䠩  䠩  ᪨   㪠-
 ᪮.

ਬ:
-------

    program OvrTest;

    overlay procedure ProcA;
    begin
      WriteLn('૥ A');
    end;

    overlay procedure ProcB;
    begin
      WriteLn('૥ B');
    end;

      procedure Dummy;
      begin
        {  楤  ࠧ 䠩  㯯 }
      end;

    overlay procedure ProcC;
    begin
      WriteLn('૥ C');
    end;

    begin
      OvrDrive(2);
      ProcA;
      OvrDrive(0);
      ProcC;
      OvrDrive(2);
      ProcB;
    end.


     맮 OVRDRIVE(2) ।뢠, ⮡ ⥬ ᪠
૥  ᪮ B: . ⥫쭮, 맮 ProcA ਢ 
  ⮬ ᪮ ࢮ ૥  䠩,  
ᮤন  ૥ 楤 ProcA  ProcB.

    騩 맮 OVRDRIVE(0) 㪠뢠, ⮡ ⥬ ᪠
쭥訥 ૥  ⥪饬 ᪮. 맮 ProcC ਢ 
 ண ૥ 䠩   ⮬ ᪮.

        ProcB;   뢠 ૥ -
楤,  室  ࢮ ૥ 䠩,    -
, ⮡ ᯥ  ⮣ 䠩  ᪮ B:  , ।
⨬ 맮 室 믮  OVRDRIVE(2).


    䥪⨢ ᯮ짮 ૥
    ==================================

    ⢥,  ਬ ૥    
ᮡ ।    室:   ணࠬ 
⥫   ࠢ ૥ﬨ,     믮
 ⥫  饭   .   ᫥,
 ૥ ॡ ⥫쭮 ஢.

     ⮣,  ⮡   ਢ    ⢥  প,
૥ ணࠬ   뢠 ᫨誮 ;  
 ணࠬ,  -⠪ ॡ ⮣ 맮, -
   ࠩ    뢠   맮 㣨
ணࠬ  ⮣  ૥ 䠩 -    ᢥ
  饭  .  㬥, ⥫쭮 ६
㤥 ࠧ  ᨬ  ⭮ 䨣樨 ᪠.
5,25- ᪥  ਢ  쥧 㢥祭 ६
믮, ⪨  -  ⥫쭮 訬  প,  
ᮢᥬ   㢥 ६ 믮 ப ᯮ㥬 
᫥ ६ RAM-.

     ᨬ쭮      ணࠬ  
㯯 ૥    ᮤঠ      ⤥
ணࠬ.  窨 ७ ⮩  ,  祬 
ணࠬ   ꥤ    ૥ 䠩,  ⥬ .
 易  ⥬,    ૥     ண-
ࠬ 筮  뤥 ,  ࠢ ࠧ ᨬ쭮
  ணࠬ, ⮬ ⠫ ணࠬ ᬮ ࠧ-
  ⮩  ᮢ襭 ᢮.  ⨬ ᮮ-
ࠦﬨ  ᬮ७묨   ६묨  প  
 ⠭ ࠧ㬭 ஬.


    ࠭祭  ૥ 
    ===================================

     
    --------------

    ૥ ணࠬ  㯯 ࠧ    
 ⨢  ,  ᫥⥫쭮,   -
⢮ ६.  ,   ⭮,  砥,   
 뢠  .   ᫥,    ࠧ-
      ,     -
      ૥.

     ਬ  1  ࠧ " ૥"    -
楤   맢   .     ਬ 2 -
 楤  One    Two  맢 楤 Three,  
૥ 楤 Three  맢      
楤, ᪮   室  ࠧ 䠩 ,  ᫥-
⥫쭮,  ࠧ ૥   ணࠬ.


    ।⥫ 
    --------------------------

     ૥ ணࠬ ⨬ ।⥫ -
 FORWARD.  ࠭祭, , 㤭 , ᫨
ᤥ ।⥫쭮  筮 ணࠬ,  -
,  ᢮ ।, 㤥 뢠 ૥ ணࠬ.


    
    --------

    ૥ ணࠬ    ४ᨢ묨.  -
࠭祭 ⠪   ⥬  筮  ண-
ࠬ,  ᠬ 뢠 ૥ ணࠬ.


    訡 ਮ 믮
    -------------------------

    訡, 騥  ६ 믮  ૥,   -
㦨  ⥬;   ⮬ ⥬ ࠡ⪨  訡
  .    ᮮ⢥ -
ன 祩  ૥ ,     ᯮ-
ᮡ ।,     ૥ ணࠬ 뫠  -
⢨⥫쭮 ⨢    訡.

    ⮬ 訡 ਮ 믮  ૥  ᥣ -
 㦨    ।⢠ " 訡 ਮ -
"   権 .  ⢥,    ⠪
⥬   祭,  ࢮ    㪠-
 .  ᫮, 訡  室  ⮬ ,
   ⠪    ᯥ宬        ᫥
ணࠬ ⮩  ᠬ ૥ 㯯.

      ,     쥧 ࠭祭, -
 ⨯  訡    ࠪ     設⢥
砥  ।,   ணࠬ  ந-
. ᫥  ⮣   筮 樨 訡  
⥫ ணࠬ  ࢮ   ૥  -
.   ⮬  砥  ।⢮  ᪠ 訡 ਮ 믮
ࠡ⠥ ࠢ쭮.

     ⥣ ⮨  ⮬,  ⮡   -
ணࠬ  ૥   ,       -
.
