          ᥬ  IBM PC.  22                            33


          
           22
          ------------------------------------------------------------
          
          ணࠬ 稪
          
          :    ᮡ 㧪  믮  㫥 
            믮.
          
          
          ------------------------------------------------------------
             
                 ᠭ ࣠  ᨨ  DOS 
          樨,    믮  DOS    㧪 믮
          㫥      믮.  DOS  ⮨   
          ᭮ ணࠬ,  ᯥ稢  㭪樨:
          
          1.     砫쭮 㧪  室    ࢮ ᥪ
               㫥 ஦ ᪥ DOS,   ⠪     ᪥,
               ଠ஢   FORMAT /S.    樨
                 ⥬  (।,    DOS  ᯮ 
               ᪮ A  C) ந室 ⮬᪠ 㧪 
               ᪠       砫쭮  㧪.   
               ।⠢ ᮡ ணࠬ,  ⥬ 㦠 
               ᪠    ணࠬ, ᠭ .
          
          2.   ணࠬ  IBMBIO.COM  ᯥ稢  䥩  
               ஢   ணࠬ BIOS    ROM;    㦠 
               ,  稭   .00600.  樠樨
               ணࠬ   IBMBIO.COM    ।   ﭨ   
               ன  㤮,    ⥬ 㦠 ணࠬ
               COMMAND.COM.  ணࠬ IBMBIO.COM ࠢ ﬨ
               -뢮        譨 ன⢠,
               ⠪    .
          
          3.   ணࠬ  IBMDOS.COM  ᯥ稢  䥩 ᮪
               ஢  ணࠬ  㦠   , 稭 
                .00B00.  ணࠬ ࠢ ﬨ
                䠩    ᪥,  ஢   ஢
               ᪮ ᥩ,  㭪ﬨ INT 21H,   ⠪ ᮤন
                㣨 ࢨ 㭪権.
          
          4.   ணࠬ COMMAND.COM 믮 ࠧ   DOS,
               ⠪  DIR  CHKDSK,   ⠪ 믮 COM, EXE 
               BAT-ணࠬ.   ⮨     ⥩: 
               १⭠  ,    樠樨   ࠭⭠
               .  ணࠬ COMMAND.COM,  ஡ ᬮ७ 
               ᫥饬  ࠧ,  ⢥砥    㧪 믮塞
               ணࠬ  ᪠  .
             
               .22.1    । . 
                ⫨    ᨬ    
          .

          
          ᥬ  IBM PC.  22                            34


             
          ------------------------------------------------------------
             砫   ணࠬ
             
             00000  ୠ ⠡ 뢠 (..23)
             00400   裡  ROM ()
             00500   裡  DOS
             00600  IBMBIO.COM
             XXXX0  IBMDOS.COM
                          ⠫
                         ᪮ 
                          ࠬ஢ ᪮  ⠡
                         । 䠩 (FAT,   
                          ᪮)
             XXXX0  ⭠  COMMAND.COM
             XXXX0  譨   ⨫ (COM  EXE-䠩)
             XXXX0  짮⥫᪨ ⥪  COM-䠩 (256 ⮢)
             XXXX0  ࠭⭠  COMMAND.COM, 뢠  ᠬ
                    訥  .
          ------------------------------------------------------------
                    .22.1.  । DOS  .
          
            COMMAND.COM
          ------------------------------------------------------------
             
             ⥬  㦠      ணࠬ  COMMAND.COM  
            ६  ᥠ ࠡ ﭭ   ६. 
          ᠭ 祭    ⥩ COMMAND.COM:
          
          1.   ⭠  ।⢥ ᫥  ணࠬ
               IBMDOS.COM (   ),    室 
               殮  ᥣ  ᥠ   ࠡ.  ⭠  
               ࠡ뢠  訡  ᪮ 権 -뢮
                ࠢ ᫥騬 뢠ﬨ:
          
               INT 22H    ணࠬ ࠡ⪨ 襭 .
               INT 23H    ணࠬ ॠ樨  Ctrl/Break.
               INT 24H    ணࠬ ॠ樨  訡 ᪮
                         権 ⥭/  ᡮ ⮪
                           ⠡ । 䠩 (FAT).
               INT 27H   襭 ࠡ, ᫥ ண ணࠬ
                         ⠥ १⭮.
          
          2.    樠樨 ।⢥ ᫥  १
                     ᮤন  ।⢠  প  AUTOEXEC-
               䠩.    砫  ࠡ ⥬    ࢮ
               砥 ࠢ.   뤠      
               ।   ᥣ  ,   㤠  ⥬  
               㦠 ணࠬ   믮.       
               ணࠬ  樠樨  ॡ    ६
               ᥠ  ࠡ.  ⮬  ࢠ     
                 뢠 㧪  ன ணࠬ 
               ᪠ ४뢠  樠樨  .

          
          ᥬ  IBM PC.  22                            35


          
          3.   ࠭⭠    㦠   ᠬ  訥 
               .  "࠭"  砥,  DOS  ४
                  㣨 ணࠬ,  ᫨ ॡ.
               ࠭⭠  ணࠬ COMMAND.COM 뢮  ࠭
               ਣ襭 DOS A>   C>,   믮 .
                 ᮤন  ࠨ騩 稪   ।祭
                㧪 COM-   EXE-䠩  ᪠    
               믮.   ᫨   㯨        믮
               -  ணࠬ,      ࠭⭠    ந
               䨪  ணࠬ  ᥣ  (PSP)  ।⢥
               ᫥    १⭮    COMMAND.COM.  ⥬ 
               㦠  襭 ணࠬ   ᪠     
               ᬥ饭  .100    砫  ணࠬ  ᥣ,
               ⠭    室   ।  ࠢ 
               㦥    ணࠬ.        ਢ   
               ᫥⥫쭮:
             
               IBMBIO.COM
               IBMDOS.COM
               COMMAND.COM (१)
               䨪 ணࠬ ᥣ
               믮塞 ணࠬ
               ...
               COMMAND.COM (࠭⭠ ,   ४).
             
             믮  RET    INT  20H     ணࠬ
          ਢ     १    COMMAND.COM. ᫨
          ࠭⭠    뫠  ४,     १⭠  
          १㦠 ࠭   ᪠  .
          
            
          ------------------------------------------------------------
             
             䨪 ணࠬ  ᥣ (PSP)   256 (.
          100)     ᥣ  ।     COM- 
          EXE-ணࠬ,     믮.  PSP ᮤন
          ᫥騥 :
          
          00    INT 20H (.CD20).
          02   騩 ࠧ  㯭    ଠ  0. 
               , 512K 㪠뢠  .8000  .80000.
          04   १ࢨ஢.
          05    맮 ᯥ 㭪権 DOS.
          OA    ணࠬ 襭.
          OE    ணࠬ ॠ樨  Ctrl/Break.
          12    ணࠬ ॠ樨  ⠫ 訡.
          16   १ࢨ஢.
          2C     ।  ࠭ ASCIIZ ப.
          50   맮 㭪権 DOS (INT 21H  RETF).
          5C   ࠬ᪠  1, ଠ஢  ⠭
                  ࠢ 䠩 (FCB1).


          
          ᥬ  IBM PC.  22                            36


          6C   ࠬ᪠  2, ଠ஢  ⠭
                  ࠢ  䠩 (FCB2); ४
               , ᫨  FCB1 .
          80-FF      ।  (DTA).
             
              ।  DTA
             
                  PSP   稭       .80  
          ।⠢  ᮡ         -뢮  
          ⥪饣  ᪮.    ᮤন    ࢮ   ᫮,
          㪠뢠饥  ᪮쪮 ࠧ 뫨      
          ।⢥  ᫥      ணࠬ.  稭 
          ண  ,  室   ᨬ  (᫨ ⠪
          ).   ᫥ ᥢ "",  ⠢訩 
           ᫥ ࠡ ।饩 ணࠬ.  騥 ਬ
           祭  DTA:
             
             ਬ 1.    ࠭. ।,   
           ணࠬ CALCIT.EXE   믮    
          CALCIT [return].  ᫥ ⮣,   DOS ந PSP  ⮩
          ணࠬ,   ⠭     .80 祭
          .000D.    ᮤন ᫮ ᨬ,  
            ᫥    CALCIT,  ᪫  ᨬ "
          ⪨".    ஬  Return    뫮   
          ,   ᫮  ᨬ ࠢ .  ன  ᮤন
          ᨬ  ⪨,  .0D.  ࠧ,  ᠬ
          .80   81  室 000D.
             
             ਬ 2.   ⥪⮢ ࠭. ।, 
          ᫥   㪠 ⥪ (   䠩),  ਬ,
          COLOR BY,  騩  맮  ணࠬ  COLOR   ।
          ⮩ ணࠬ  ࠬ "BY"   ⠭ 㡮 梥
           ⮬ 䮭.  ⮬ 砥, 稭   .80, DOS
          ⠭ ᫥騥 祭 :
             
                         80:  03 20 42 59 0D
             
                   3,  ஡,  "BY"   
          ⪨.
             
             ਬ  3.     䠩   ࠭. ணࠬ
          ⨯ DEL (㤠 䠩) । ᫥  ணࠬ
            䠩  ⢥  ࠬ.  ᫨ 㤥 ,
          ਬ,  DEL  B:CALCIT.OBJ  [return],    PSP,  稭 
          ᮢ .5C  .80, 㤥 ᮤঠ:
             
                    5C:  02 43 41 4C 43 49 54 20 20 4F 42 4A
                            C  A  L  C  I  T        O  B  J
                    80:  0D 20 42 3A 43 41 4C 43 49 54 2E 4F 42 4A 0D
                               B  :  C  A  L  C  I  T  .  0   B  J
             



          
          ᥬ  IBM PC.  22                            37


             稭   .5C,  室   FCB,
          ᮤঠ騩    䠩,      㪠    ࠬ,
          CALCIT.OBJ,     믮塞  ணࠬ.  ᨬ
          㪠뢠  ᪮ (02=B   砥).   
          CALCIT 室   ஡,      䠩
            쬨  ᨬ,    ⨯ 䠩,  OBJ.  ᫨   
          ࠬ, ਬ:
             
                         progname A:FILEA,B:FILEB
             
          ⮣ DOS ந FCB   FILEA  ᬥ饭 .5C   FCB
           FILEB  ᬥ饭 .6C.
             稭   .80   ⮬ 砥  ᮤন ᫮
           ᨬ ( ࠬ஢) - 16, ஡ (.20)
          A:FILEA,B:FILEB  ᨬ  ⪨ (OD).
               PSP ।⢥ । 襩 ணࠬ,
                 PSP    ࠡ⪨ 㪠
          䠩      ।ਭ  ।  ⢨.  
          樨  DTA COM-ணࠬ    
          .80  ॣ SI    ᫥騬 ࠧ:
             
                         MOV  SI,80H              ; DTA
                         CMP  BYTE PTR [SI],0     ;  ?
                         JE   EXIT
             
               EXE-ணࠬ    㢥७ ⢥ত, 
            ᥣ  ।⢥  ᯮ  ᫥ PSP.
          ,     樠樨 ॣ DS   ES ᮤঠ
            PSP,  ⠪   ࠭ ᮤন  ॣ ES
          ᫥ 㧪 ॣ DS:
             
                         MOV  AX,DSEG
                         MOV  DS,AX
                         MOV  SAVEPSP,ES
             
               ᯮ짮 ࠭    㯠 
           PSP:
             
                         MOV  SI,SAVEPSP
                         CMP  BYTE PTR [SI+ 80H],0     ;  ?
                         JE   EXIT
          
          DOS ᨨ 3.0    ᮤন   INT 62H, 㦠
            ॣ BX  ⥪饣 PSP,    ᯮ짮
            㯠    PSP.
          
           COM-
          ------------------------------------------------------------
             
              ⫨稥  EXE-䠩, COM-䠩  ᮤন  
          ᪥.    ࣠ COM-䠩   ,  
          DOS 室 "" ⮫쪮 ,  ⨯ 䠩 - COM.


          
          ᥬ  IBM PC.  22                            38


              ᠭ ,  㦥   COM-  EXE-䠩
          । 䨪 ணࠬ ᥣ.   
          ⮣ 䨪 ᮤঠ  INT 20H (  DOS). 
          㧪   COM-ணࠬ   DOS   ⠭      
          ᥣ   ॣ     ࢮ     PSP.  ⥬
          ⠭  㪠⥫  ⥪      64  ⮢
          ᥣ  (.FFFE)     ,  ᫨ ᥣ 
          筮 让.  設 ⥪  㫥 ᫮.
              㪠⥫  頥  .100  (ࠧ PSP).
          ᫥ ⮣ ࠢ ।   ॣ஢ 
          CS:IP,  ..    ।⢥ ᫥ PSP.  
             砫   믮塞   COM-ணࠬ     
          ᮤঠ 믮 .
              室  ணࠬ  RET    ॣ IP
          㫥  ᫮,  ஥ 뫮  ᠭ   設 ⥪ 
          樠樨.    ⮬  砥    ॣ஢    CS:IP
          砥  ࢮ   PSP,    室 
          INT 20H.  믮 ⮩  ࠢ । 
          १   COMMAND.COM.  (᫨ ணࠬ 蠥
            INT 20H  RET,  ࠢ ।⢥
          ।  COMMAND.COM).
          
           EXE-
          ------------------------------------------------------------
             
             EXE-, ᮧ 騪, ⮨  ᫥
           ⥩: 1)  - , ᮤঠ ଠ 
          ࠢ   ன ணࠬ   2)  ᮡ⢥ 㧮
           .
                室 ଠ   ࠧ 믮塞
          ,  㧪  ,  ⥪  ⭮⥫
           ᬥ饭,      設   
          ᮮ⢥⢨  ⭮⥫묨 . ﬨ:
          
          00   .4D5A.  騪 ⠭    
               䨪樨 ࠢ쭮 EXE-䠩.
          02   ᫮ ⮢  ᫥  EXE-䠩.
          04   ᫮ 512  ⮢    EXE-䠩,   
               .
          06   ᫮ ࠨ ⮢.
          08   ᫮  16-⨡⮢   (ࠣ䮢)   ,
               (室  樨 砫 믮塞 ,
               ᫥饣 ᫥ ).
          OA   쭮 ᫮ ࠣ䮢,    室
               ᫥ 㦥 ணࠬ.
          OC   ४⥫  㧪   訥   訥 .
                 ணࠬ  ,   
               ணࠬ  㦠  믮   訥 
                  訥.    㧪  
               訥 .  祭 .0000 㪠뢠  㧪 
               訥 ,   .FFFF -  訥.  祭
               ।   ᨬ쭮  ᫮   ࠣ䮢,  
                室 ᫥ 㦥 ணࠬ.

          
          ᥬ  IBM PC.  22                            39


          OE   ⭮⥫     ᥣ   ⥪    믮塞
               㫥.
          10   ,   稪    ॣ SP
               । ।祩 ࠢ  믮 .
          12   ஫쭠 㬬 -  㬬  ᫮  䠩 ( 
               ९) ᯮ  ஢ન   .
          14   ⭮⥫ ,  稪  
                 ॣ  IP    ।  ࠢ   믮塞
               .
          16   ⭮⥫      ᥣ   믮塞
               㫥.   稪   ॣ CS.
          18   饭 ࢮ ࠨ   䠩.
          1A    ૥ ࠣ:   砥,  
                ⭮  १⭮  EXE-䠩.
          1C      ன,    ᮤঠ   ६   ᫮
               ࠨ  ⮢,  ᮮ⢥饥  祭 
               ᬥ饭 06.
             
                 ࠧ  512  ⮢   
           ,  ᫨ ணࠬ ᮤন 讥  ᫮ ࠨ
            ⮢.   06     㪠뢠 ᫮
          ⮢   믮塞  㫥,  㦤   ன.
             ன  ⠡,  稭饩  樨
          1C ,  ⮨   塠⮢  稭  ᬥ饭 
          塠⮢ ᥣ 祭.
             ⥬  ந  䨪 ணࠬ  ᥣ ᫥ 
          १⭮   COMMAND.COM,    믮 
          㧪. ⥬ COMMAND.COM 믮 ᫥騥 ⢨:
          
              뢠 ଠ஢    .
               ࠧ 믮  (騩 ࠧ 䠩
                樨 04   ࠧ     樨  08) 
               㦠     砫 ᥣ.
              뢠  ⠡ ன   ࠡ 
                ਡ 祭   ⠡  砫
               ᥣ ( OE).
              ⠭  ॣ SS  SP 祭  
                ਡ  砫 ᥣ.
              ⠭   ॣ  DS    ES  ᥣ 
               䨪 ணࠬ ᥣ.
              ⠭  ॣ CS  PSP  ਡ 
               稭 ᬥ饭    ( 16)   ॣ CS.
               ᫨ ᥣ   ।⢥ ᫥    PSP, 
               ᬥ饭   ࠢ 256  (.100). ஢
                CS:IP ᮤন ⮢    ᥣ,
               .. 砫  ணࠬ.
             
             ᫥ 樠樨 ॣ CS  SS  ᮤঠ ࠢ
          ,    ॣ DS  (  ES)      ⠭ 
          ணࠬ   ᮡ⢥ ᥣ⮢ :
             
             1.  PUSH  DS     ;  PSP  ⥪
             2.  SUB   AX,AX  ; 㫥 祭  ⥪

          
          ᥬ  IBM PC.  22                            40


             3.  PUSH  AX     ;   ᯥ祭 室  ணࠬ
             4.  MOV   AX,datasegname   ;⠭  ॣ DX
             5.  MOV   DS,AX            ;   ᥣ 
             
              襭 ணࠬ  RET   ॣ IP
          㫥 祭,  ஥  뫮  饭   ⥪   砫
          믮 ணࠬ.  ॣ஢  CS:IP  ⮬ 砥
          砥  ,     ᮬ  ࢮ 
          PSP,   ᯮ   INT  20H.     
          㤥 믮, ࠢ ३  DOS.
          
           EXE-
          ------------------------------------------------------------
             
             ᬮਬ ᫥ ⠡  (MAP) ணࠬ:
             
                    Start     Stop      Length    Name      Class
                    00000H    0003AH    003BH     CSEG      CODE
                    00040H    0005AH    001BH     DSEG      DATA
                    00060H    0007FH    0020H     STACK     STACK
                    Program  entry point at 0000:0000
             
              MAP  ᮤন  ⭮⥫  ( ⢨⥫)
                 ᥣ⮢.   H ᫥ 
          祭 㪠뢠  ⭠ ଠ. ⨬, 
          騪  ࣠   ᥣ  ᫥⥫
           ⫨筮  ⮣,   뫨 ஢  ணࠬ
          .
              ᮮ⢥⢨  ⠡楩  MAP  ᥣ  CSEG 
               00000  -  ⭮⥫  
          砫   믮塞  .        ᥣ
          ⠢ .003B ⮢. 騩 ᥣ   DSEG
          稭      .00040     .001B.
           .00040    ᫥ CSEG  ᮬ, ஢
              ࠭  ࠣ  (..    祭  ⭮
          .10).  ᫥  ᥣ,  STACK,  稭  
          .00060  -  ࢮ ᫥  DSEG,    ஢ 
          ࠭ ࠣ.
                ⫠稪  DEBUG    ஢ ᮤন
          , ⠪   㧪 ணࠬ  믮 DOS
          頥  䨪ᮬ ணࠬ  ᥣ. ,
            뭪 ணࠬ ᯥ祭   ࠧ ࢨ
           ⨫ (   ᮡ⢥),   
            ᬠਢ ᮤন    ᪮  ᥪ 
          ⭠筮  ଠ.     ᬠਢ
          ਬ ணࠬ ᮤন  ᫥ ଠ (ᮤন
          ᫮ ।⠢  ⭮ ᫥⥫쭮 ⮢).
          
          00   .4D5A.
          02   ᫮ ⮢  ᫥ : 5B00.
          04   ᫮ 512  ⮢   䠩,   :
               0200 (.0002512=1024).


          
          ᥬ  IBM PC.  22                            41


          06   ᫮ ⮢  ⠡ ன,  室饩 ᫥
               ଠ஢  : 0100, .. 0001.
          08   ᫮  16   ⮢   ⮢      :  2000
               (.0020=32  3216=512).
          0C   㧪  訥 : .FFFF.
          0E   ⭮⥫  ⥪ ᥣ:  6000  .
               60.
          10     㧪  SP: 2000  .20.
          14   饭  IP: 0000.
          16   C饭  CS: 0000.
          18   C饭  ࢮ ࠨ  : 1E00 
               .1E.
             
             ᫥ 㧪 ணࠬ  ࠢ  ⫠稪 DEBUG
          ॣ  ᫥騥 祭:
             
                         SP = 0020      DS = 138F      ES = 138F
                         SS = 13A5      CS = 139F      IP = 0000
             
              EXE-㫥 稪 ⠭  ॣ  DS 
          ES    䨪  ணࠬ  ᥣ,  饭  
          㯭   ,     ॣ  IP,  SS    SP -
          祭   ணࠬ.
             
              SP
             
             稪 ᯮ .20     樠
          樨 㪠⥫ ⥪ 祭  ⥪.    ਬ
          ⥪   ।,   16  DUP (?),  .. 16 塠⮢
           饩  32  (.20) .  SP 㪠뢠
           ⥪ 設 ⥪.
             
              CS
             
              ᮮ⢥⢨  祭  ॣ DS  ᫥ 㧪
          ணࠬ,   PSP ࠢ .138F(0).    PSP 
           .100 ⮢,  믮塞 , ᫥騩 
          ।⢥ ᫥ PSP,  室    .138F0+100=
          139F0.   祭 ⠭  稪  ॣ
          CS.    ࠧ,  ॣ CS  । 砫 
            ணࠬ (CSEG).     D CS:0000
           ⫠稪 DEBUG  ᬮ  ०   設
             .       筮   
          ⭠筮     ᥬ୮   LST  䠩  ஬
          ࠭, ⬥祭 ᨬ R.
             
              SS
             
              ⠭  祭    ॣ  SS  稪 ⠪
          ᯮ ଠ  :
             
                    砫  PSP (.DS)   138F0
                     PSP                       100

          
          ᥬ  IBM PC.  22                            42


                    ⭮⥫  ⥪        60
                     ⥪                   13A50
             
              DS
             
             稪 ᯮ ॣ DS   ⠭ 砫쭮
           PSP.     ᮤন ⮢ ,
           ॣ DS 室 樠஢  ணࠬ ᫥
          騬 ࠧ:
             
                    0004 B8 ---- R      MOV  AX,DSEG
                    0007 8E D8          MOV  DS,AX
             
             ᥬ ⠢  設  ᥣ
          DSEG,   ⠭ ⮬ ⠡ ன  
          .    ⫠稪 DEBUG  ᬮ 襭
             ᫥饬 :
             
                                   B8 A313
          
          祭 A313  㦠    ॣ  DS      13A3. 
          १ 
          
                                 饭
                           CS      139F0        00
                           DS      13A30        40
                           SS      13A50        60
          
            ⢥  ࠦ  믮  ஢   襩
          ᪮  ணࠬ  ࠢ ⫠稪  DEBUG 
             騥 祭  ॣ:
          
                                 騥 ॣ
                         PUSH DS        IP  SP
                         SUB  AX,AX     IP  AX (᫨   )
                         PUSH AX        IP  SP
                         MOV  AX,DSEG   IP  AX
                         MOV  DS,AX     IP  DS
          
           DS ᮤন ⥯ ࠢ  ᥣ .
            ᯮ짮  ⥯   D  DS:00   ᬮ
          ᮤন ᥣ    DSEG      D  SS:00 
          ᬮ ᮤন ⥪.
          
              
          ------------------------------------------------------------
             
             ᬮਬ  ⥯,       㧨    믮
          ணࠬ    㣮   ணࠬ.   㭪   .4B  
             ணࠬ  㧨    ணࠬ 
                室  믮.    ⮩ 㭪樨
          室 㧨   ASCIIZ-ப    ॣ  DX, 


          
          ᥬ  IBM PC.  22                            43


            ࠬ஢   ॣ BX  (  ⢨⥫쭮 
          ॣ஢  ES:BX).  ॣ AL ⠭ 
          㭪樨 0  3:
             
             AL=0.  㧪  믮.   ⠭
           䨪  ணࠬ  ᥣ      ணࠬ, 
          ⠪  ணࠬ  ॠ樨    Cntrl/Break    
          ।  ࠢ   ᫥   ᫥ 襭
           ணࠬ.     ॣ,  SP, 
          ᢮  祭,          窮. 
          ࠬ஢, 㥬  ES:BX,  ᫥騩 ଠ:
             
               饭       祭
                  0      塠⮢ ᥣ  ப
                         ࠬ஢  ।.
                  2      塠⮢ 㪠⥫   ப
                          PSP+80H.
                  6      塠⮢ 㪠⥫   FCB
                          PSP+5CH.
                 10      塠⮢ 㪠⥫   FCB
                          PSP+6CH.
             
             AL=3.  ૥  㧪.      㦠
          ணࠬ    ,    ᮧ PSP    稭
          믮.     ࠧ      ᮧ  ૥
          ணࠬ.   ࠬ஢     ॣ஢ 
          ES:BX   ᫥騩 ଠ:
             
               饭       祭
                  0      塠⮢  ᥣ  㧪
                         䠩.
                  2      塠⮢ 䠪 ன 㧮筮
                         .
             
                 訡,  頥  ॣ AX: 01,
          02,  05,  08, 10  11. ணࠬ  .22.2 訢 DOS
          믮    DIR    ᪮  D.   믮  
          ணࠬ,    EXE-.  (  ७  ୠ PC
          Magazine   ).
          
          ------------------------------------------------------------
          ------------------------------------------------------------
               .22.2. 믮  DIR  ணࠬ.











          
