                           ஫  i8272.                   ˻
                  ᠭ ࠡ ஫  ⥬ .     i8272
                                                                    ʼ
      㯠    ஭    ஫  8272  2 ॣ:
ॣ ﭨ  ॣ .   ﭨ (Main Status Register)
ᮤন ଠ  ﭨ ஫    ⠭ ஬ 
 ६.  १ ॣ  ஫ ⢫    ᥬ
७ ॣࠬ 8272,   뢠   ⢫ 
묨  ᪮.  ﭨ  ⮫쪮 뢠.  롮 
    ॣ஢  ᯮ 뢮 0 8272 (.5).   0=0 
ॣ ﭨ,  0=1  ॣ .

                          ଠ ॣ ﭨ:
              ͻ
               RQM  DIO  NDM   CB  D3B  D2B  D1B  D0B 
              ͹
               DB7  DB6  DB5  DB4  DB3  DB2  DB1  DB0 
              ͼ

                     ᠭ ࠧ冷 ॣ ﭨ:

  RQM  - Request For Master
       ନ   ⮢   묨  設 .
       RQM = 1 - ஫   ⮢.
  DIO  - Data Input/Output
       ନ    ࠢ 뫪 :
       DIO = 1 - ࠢ 뫪 -   (Read),
       DIO = 0 - ࠢ 뫪 -   (Write).
  NDM  - Non DMA Mode
        ० -  NDM = 0 뢠,   祭 䠧 ᯮ
       .
  CB - FDC Busy
       ᫨  CB = 1,   砥,  ஫     -
       믮  ⥭/.
  DB3..DB0 - Drive n Busy
          뢠  ﭨ      4-  ⥫.   ᫨
       ᮤন     =  1,      ᮮ⢥饣  ⥫  
       饥 ६ 믮  Seek.

                          饥 ᠭ ஫.
                         
      ⥬    ஫  8272  室  15 .   
 ⭮ 뫪   設      ॣ  
஫.    믮    ⠪    .
  㤮 ।⠢ 饩  3- 䠧:
     *   ਪ  - ஫ ਭ   ᫥⥫쭮
               , 室  믮 .
     *  ᯮ - ஫ 믮 ।  .
     *  १ -    뢠  ﭨ  ஫  ᫥
               믮    ଠ.

      䠧 ਪ  १ । ।祩   / ॣ
 ஫,    뢠 ᮤন ॣ ﭨ
஫.   RQM  DIO ॣ ﭨ   ⠭  1 
0 ᮮ⢥⢥ । ⥬,   ।  㤥 ।    ஫.
   ⮢묨,  ⮬   室 뢠
 ஢ ॣ ﭨ । 뫪    ஫. 
䠧  १    RQM    DIO   ⠭  1 । ⥭
   ஫.  ⬥⨬,   ⥭ ॣ ﭨ  ।
뫪   室 ⮫쪮  䠧 ਪ  १.
      䠧 ᯮ ॣ ﭨ 뢠  㦭. ᫨ ஫
室    ० NON DMA (-),   ।   
⥭   ᪠  ᮯ஢    ᨣ  뢠  INT=1.  
  ᨣ  ⥭  (RD=0),  ᨣ  뢠 뢠  
뤠  設  .  ਬ,  ᫨        㦨
뢠  筮   ( 13 ᥪ.    ⭮),  
 訢 ॣ ﭨ      D7  (RQM)  ᮮ⢥  ᨣ
뢠.    믮      筮  ᨣ  WR=0
뢠 뢠.
     ᫨ ஫  室    ०  DMA (),   뢠  䠧
ᯮ  .  ஫    ⮬  砥  뤠  ᨣ  DRQ
( )   ।  .  ஫  ⢥砥
   ᨣ  ⢥ত    DACK=0    RD=0.    
ᨣ  DACK 뢠 ᨣ DRQ.   믮 樨  
ᨣ RD  ᨣ WR=0.
      砭  䠧  ᯮ  (  ᨣ  -  )
  뢠,  饥  砫  䠧  १.    ⥭
ࢮ  १ ᨣ 뢠 뢠.
     室 ભ,    䠧 १  ,  㪠  
⠡  ,    ⠭ ஬.  ਬ,   ⥭
  7  १   7     ⠭    浪,
㪠  ⠡ ,   ᯥ譮 襭 樨. ஫ 
ਬ ᫥    ,      ⠭    7  
१ ᫥ 믮  ⥭.
     ஫ 8272  ᮤন  5  ॣ஢   ﭨ:      ॣ
ﭨ   (Main  Status  Register)    ॣ  ST0-ST3.    ॣ
ﭨ (  ॣ ﭨ)      ⠭  ஬  
 ६.  ST0-ST3 㯭  ⮫쪮  䠧 १ 
  ⠭  ᫥ 襭 ன .  ⭠ 
।, ᪮쪮   ॣ     ⠭.
      , 뢠  ஫  䠧 ਪ  뢠 
    䠧  १,   ᫥  浪,  㪠  ⠡
.    ᫥⥫쭮⥩  ᪠.  ᫥  祭
᫥   ஫ ⮬᪨ 稭 믮 ,
室  䠧 ᯮ.  ᫥ ⮣,    䠧 १  뢠
᫥  ,  ஫  ⠥      襭    ⮢  
ࠡ⪥ ᫥饩 .      ४饭  ⮫쪮  祩
ᨣ      =1.   㤮 ।⢮  "ਢ祭 "
஫  ᪨ .
     ᫥ ।    ஫    Specify,  設 롮 ⥫
稭 ⮬᪨ ᪠஢  ஬⪠    (  ⠪
  ᠬ  蠣      Seek).  ஫  訢 ﭨ
ᨣ ⮢ Ready  4- ⥫.  ᫨  ᨣ  Ready  
᢮   ﭨ   (筮  -    ન  ⥫),  ஫
 뢠.   ।祩   Sense  Interrupt  Status
뢠  ᮤন  ॣ  ST0       NR (Not Ready) ॣ ST0
। ﭨ ⥫.

                          ᠭ  8272.
                         
      䠧 ਪ ।      訢  ॣ
ﭨ 8272.  ⮬  DIO (D6)  RQM (D7)   祭 0  1
ᮮ⢥⢥ ।      ஫.  砫 䠧
믮 뢠 ⠭  ⮢  1  0 ᮮ⢥⢥.

 Read Data                                                     ⥭ 
                                                      
       ⮩   ஫ । ᫥⥫쭮  9
 (. ⠡ ). ᫥ 祭 ⮩ ᫥⥫쭮 ஫
뤠  ᨣ        孮  ᪠  (᫨  ⢥),
ࠡ뢠         (      Specify)  
稭      ᭮   ⪨   ᥪ,   ᫥  祣  뢠  
䨪 ᥪ.   ⥪騩    ᥪ  ("R"),  ࠭騩  
ॣ  IDR  ᮢ   ஬ ᥪ,  ⠭  ᪠,  ஫
稭      ᥪ    ᫥⥫쭮,    
⮬, 뤠   設 .
     ᫥ 砭 ⥭ ᥪ  ஫  ६    1  
ᥪ  稭 뢠   ᫥饣 ᥪ.    
 ᥪ୮.  믮    ४饭  祩
ᨣ  TC  (Terminal  Count  -    ).  ᫥  ਭ  ᨣ 
஫ ४頥 ।    設  ,    த  
  ⥪饣  ᥪ   ⮢ CRC-஫,  ᫥ 祣 
४頥.
     ⢮ ,    뢠,    祭 ⮢ MT,
MFM  N,   .
             ஦   (multitrack)   ०   ஫,
騩  뢠      ஭  (஦)  ᪠.    ⮬
砥  㪠 樫  ।  ᥪ,  稭  ᥪ
1 ஭ 0  稢 ᫥ ᥪ஬  ஭  1.  ⨬,    
० ⭮ ⮫쪮   樫.
      砥  N=0  祭  DTL  ।  ⢮   ,   
஫    ࠪ⮢      ᥪ.  ᫨ DTL  ⨭
ࠧ ᥪ,     ᥪ ᫥ । DTL    ।
  設 .  ஫  뢠 ᥪ ,    ⮢
CRC஫ ,  ᫨    ,   த  ᥪ୮
⥭. ᫨ N > 0,  祭 DTL   ⠭  0FFH.
     ᫥ 襭 ⥭ ஫    ⢮    ⥫  
孮  ᪠    祭  ࢠ  ६,  㪠   
Specify.  ⮬   ᫥⥫묨 묨  饭ﬨ  
⠥ ਦ⮩  孮 ᪠.
     ᫨ ஫ ன ࠧ 㦨  ,   㦨
ࠢ쭮  ᥪ ( R),   ⠭ 䫠 ND (No Data)
 ॣ ST1    稢  믮    (  ॣ  ST0  ⠪
⠭  D7  D6  0  1 ᮮ⢥⢥).
     ᫥ ⥭    䨪            ᥪ,
஫  ந CRC-஫ ⠭ ⮢.  ᫨ 㦥 訡
CRC   䨪 ᥪ,  ஫ ⠭  䫠  DE  (Data
Error)    ॣ  ST1,  ᫨    訡 㦥    ᥪ,
஫ ⠭ 䫠 DD (Data error in Data field)  ॣ ST1. 
    ⠭    D7    D6    ॣ  ST0    0   1
ᮮ⢥⢥,  믮  蠥.
     ᫨ ஫ 砥  થ 㤠   ᫨  SK
(Skip -  D5  )  ⠭,   ஫ ⠭ 䫠 CM
(Control Mark)  ॣ ST2  稢  ᫥ ⥭  
ᥪ.  ᫨   SK=1,  ஫ ய᪠    ᥪ    稭
뢠 ᫥騩.
      ६ ।    㦨 ஫  ०
1  ࠧ    27 ᥪ.   ୮ ⭮  13 ᥪ.  -  .  
⨢ 砥 ஫ ⠭ 䫠 OR (Over Run)  ॣ ST1 
稢 .
     ᫥ 襭 樨 ⥭ ( ⠪ ⭮    
) ଠ,   뢠    ஫   䠧 १ (
C-H-R-H)    祭  ⮢      .


 Write Data                                                    
                                                    
            ⮩   ஫ । ᫥⥫쭮
 9  (.  ⠡ ).  ᫥ 祭  ᫥    
஫  뤠  ᨣ    孮 ᪠ (᫨  뫠
⢥)  ࠡ뢠 প    ,      
Specify    稭     䨪 ᥪ.  ᫨ ⥪騩 
ᥪ ("R")  ࠭騩    ॣ  IDR,  ᮢ    ஬  ᥪ,
⠭  ᪠   䨪 ᥪ, ஫ ᫥⥫쭮,
  ⮬,  訢     設    뢠
    ᥪ  . ᫥ 砭   ⥪騩 
ᥪ 㢥稢  1   ந    ᫥饣    .
  ᥪ   ஫ த   , 
  ᨣ  ( ).   㯫  ᨣ    ஫
த    ⥪騩 ᥪ   .  ᫨ ஫
ਭ ᨣ       ,    ⠢襥    
  ﬨ.
       ஫ 뢠  䨪    ᥪ      ந
CRC-஫  ⠭  .  ᫨    㦨  訡 CRC   
ᥪ஢,   ⠭ 䫠 DE (Data Error)  ॣ ST1  稢
   (   ॣ   ST0     D7    D6  ⠭    0    1
ᮮ⢥⢥).
              筠    ⥭  .  
᫥  ࠪ⨪,   ⥭ :
     * ⢮ । .
     *  EN (ENd of cylinder).
     *  ND (No Data).
     * 㧠  ⢮  HUT.
     * ଠ,  뢠  䠧 १,  ᫨  뢠
       믮 .
     * । DTL,  N=0  N>0.

      ०            ஫     
室   ० 1 ࠧ  31 ᥪ.   ୮ ⭮  15 ᥪ.  -
 .  ⨢ 砥 ஫ ⠭ 䫠 OR (Over Run) 
ॣ ST1  稢 .

 Write Deleted Data                                   㤠 
                                   
      筠    Write Data  ᪫祭 ⮣,   
᭮ થ  뢠  થ 㤠 .

 Read Deleted Data                                   ⥭ 㤠 
                                    
      筠    Read  Data    ᪫祭  ,  
஫  㦨  થ   砫   ᥪ.
᫨  SK=0, ஫ 뢠   ᥪ, ⠭ 䫠 CM
 ॣ ST2  稢 .  ᫨  SK=1,  ஫ ய᪠
 ᥪ  室  ⥭ ᫥饣.

 Read a Track                                                 ⥭ ஦
                                                  
        Read Data  ᪫祭 ⮣,    
뢠 뢭   ᥪ ஦. ࠧ  ᫥ 㦥
᭮  ஫ 稭 뢠      ஦
  뢭  .  ᫨ ஫ 㦨 訡 CRC  
䨪    ,    த  뢠       ஦.
஫ ࠢ ଠ   䨪, ⠭  
ᥪ,   祭  IDR  ⠭ 䫠 ND  ॣ ST1, ᫨ 
 ᮢ.    SK  뢠 ﭨ  ஫.
     믮  稢,  ஫ ⠥  ᥪ஢.
᫨  ஫  襫 ᭮ થ  䨪  ⮣,  
ன ࠧ ਭ    ,    ⠭  䫠    (Missing
Address  Mark)    ॣ  ST1    稢    (  ॣ  ST0
⠭  D7  D6  0  1 ᮮ⢥⢥).

 Read ID                                               ⥭ 䨪
                                                
        ᯮ    ।  ⥪饣   
/⥭ ⥫.  ஫    ଠ,  ⠭  
ࢮ  祭    䨪 ᥪ.  ᫨  室 ண
᭮    ஫      ⨫   ᭮   થ   
䨪,   ⠭ 䫠   ॣ ST1.  ᫨  ஫
 襫 ,    ⠭ 䫠  ND    ॣ  ST1    
稢.

 Format a Track                                       ଠ஢ ஦
                                        
      ଠ  ஦.  ᫥ 㦥 ᭮  
      뢠   ᫥騥  :  GAPS,    થ,  
䨪      ,  ᮮ⢥騥  ⠭  IBM  System  34
(ୠ ⭮)  IBM System 3740 ( ⭮).
     ଠ    ᫥騬 ணࠬ㥬묨 祭ﬨ:
     * N   - ᫮   ᥪ.
     * SC  - ᫮ ᥪ஢  樫.
     * GPL -  ᥪ୮ ஬⪠.
     * D   -     .
 ࠬ  ।    ஫  ஬   䠧 ਪ.  
  ᥪ 㤥  ⠬  D.    䨪  
  ᥪ    ஬   䠧 ᯮ.  室  4
祭   ᥪ:
     * C -  樫
     * H -   (孮)
     * R -  ᥪ
     * N -   ᥪ
 ,         室,      ଠ஢  
᫥⥫묨 ࠬ ᥪ஢.
     ᫥ ଠ஢    ᥪ     । 
祭 C,H,R,N     ᥪ    ஦.  ন  ॣ  R
㢥稢   1 ᫥ ଠ஢  ᥪ,  ,  ᫥⥫쭮,
 ॣ 㤥 ᮤঠ 祭 R+1  뢠   䠧 १.
    㤥 த  ᥩ ஦,   ன ࠧ  㤥
㦥  . ᫥ ⮣ 믮  蠥. ᫨
    ⥫ ਭ ᨣ Fault,  ஫ ⠭
䫠   ॣ ST0  稢  ( D7  D6    ॣ  ST0
⠭     0    1  ᮮ⢥⢥).  ⢨  ᨣ  Ready  
⥫  砫 䠧 ᯮ ⠪ ४頥 믮 .
      ⠡ ਢ ᮮ⭮襭   N, SC, GPL  ࠧ ࠧ஢
ᥪ஢.
                 ͻ
                    SD - (MFM = 0)       DD (MFM = 1)    
     ͹
       N   SC   GPL1  GPL2   SC   GPL1  GPL2 
     ͹
       128   0   1A    07    1B    --    --    --  
       256   1   0F    0E    2A    1A    0E    36           
       512   2   08    1B    3A    0F    1B    54           
      1024   3   04    47    8A    08    3F    74  
      2048   4   02    C8    FF    04    99    FF  
      4096   5   01    C8    FF    02    C8    FF  
      8192   6   --    --    --    01    C8    FF  
     ͼ


 Scan Commands                                           ᪠஢
                                           
      ᪠஢   ⠭    ᪠    ࠢ  
묨,  뤠  ஬  (஫஬ ).  ஫ ࠢ
 ᫥⥫쭮,   ⮬  ஢ ᫮:
     DD = DP        DD <= DP       DD >= DP
 DD -   ᪠; DP -   .
     ᫥ ஢ન ᥣ ᥪ,  ᫨ ᫮  믮, ந
६  ᥪ (R + STR -> R)   ᪠஢ த.
 㤥 த   ,    ந   ᫥
᫮:
     * 믮 ᫮ ᪠஢ (ࠢ,   )
     * ⨣ ᫥ ᥪ ()
     * ਭ ᨣ 
᫨ ᫮ ᪠஢ 㤮⢮७,  ஫  ⠭  䫠  SH
(Scan Hit)  ॣ ST2  蠥 .  ᫨ ᫮  㤮⢮७
 ஬⪥  砫  ᥪ஬  (  R)    ᫥  ᥪ஬
樫  (),  ஫  ⠭  䫠  SN  (Scan Not Satisfied) 
ॣ ST2  蠥 .
     ᫨   ६ 樨 㯨 ᨣ     ஫
, ஫ ४頥 ࠢ  ⥪饬   蠥 .
       ⠡ ਢ ﭨ ⮢ SH  SN ᫥ ࠧ ᫮
᪠஢:
                ͻ
                                   .ST2           
                 ஢ .. ͹ ਬe砭
                                    SN SH           
                ͹
                               0  1   DD = DP  
                                    1  0   DD <>DP  
                ͹
                   ࠢ   0  1   DD = DP  
                                    0  0   DD < DP  
                                    1  0   DD > DP  
                ͹
                   ࠢ   0  1   DD = DP  
                                    0  0   DD > DP  
                                    1  0   DD < DP  
                ͼ


     ᫨ ஫ 㦨  થ 㤠    
ᥪ஢   SK=0,   ⠥   ᥪ  ᫥  ᥪ஬  樫,
⠭ 䫠 CM (Control Mark)  ॣ ST2  蠥 . ᫨
  SK=1,  ஫ ய᪠  ᥪ  뢠 ᫥騩.  ⮬
砥  ஫  ⠭  䫠 CM  ॣ ST2,  ᨣ騩 
⮬,   祭 㤠 ᥪ.
          ணࠬ    祭   STP   (STP=01      ࠡ⪨
᫥⥫ ᥪ஢,  STP=02   ⥭  १    ᥪ)    
(Multitrack), 室 ,  ᫥ ᥪ  ஦  
⠭.  ਬ,  ᫨  STP  =  02,      =   0,   ᥪ   ஭㬥஢
᫥⥫쭮   1  26,   Scan 稭  ᥪ 21,   ᯥ譮
 ࠡ⠭ ᥪ 21, 23  25.  ᥪ 26 㤥 ய饭,  ⥬
ਤ  .   맮 ଠ쭮 襭 樨. ᫨
  ࠢ﫮 25,   ᪠஢  稭  ᥪ 20,   
Scan 訫  ᯥ譮.
     筮  ⥭/,    ஫   
㦨  ஫  27 ᥪ.   ୮ ⭮  13 ᥪ.
 .   ⨢ 砥 ஫ ⠢ 䫠  OR  (Over  Run)  
ॣ ST1  ४ 믮 .


 Seek                                                樮஢
                                                
      /⥭ ⥫ ६頥  樫   樫  
 Seek. ஫ ࠢ ᮤন ॣ PCN (Present Cylinder
Number),   ࠭ ⥪饥       ᮤন  NCN  (New
Cylinder   Number)  -      ,          
ᨬ  १ ࠢ 믮 ᫥騥 ⢨:
     * PCN  < NCN - ᨣ ࠢ  ⥫ ⠭  "1" 
                    뤠  蠣.
     * PCN  > NCN - ᨣ ࠢ  ⥫ ⠭  "0" 
                    뤠  蠣.

      뤠 ᮢ 蠣    Specify  祭 SRT
(Stepping Rate Time). ᫥   蠣  ࠢ 祭
PCN  NCN   PCN = NCN,  ஫ ⠭ 䫠 SE (Seek  End)  
ॣ ST0  蠥 믮 .
      䠧 ਪ ஫  室    ﭨ  FDC  Busy  (),
    䠧  ᯮ  ஫  室   ﭨ NON Busy (
).   ஫ 室  ﭨ NON Busy,      
㣨   樨  Seek      ⮬  砥    樮஢  㤥
믮 ६  ᪮쪨 ( 4-) ⥫.
     ᫨ ।  砫 䠧 ᯮ   ६ ᯮ  Seek
⥫  室    ﭨ  Not   Ready   (   ⮢),   ஫
⠭ 䫠 NR (Not Ready)  ॣ ST0   蠥.

 Recalibrate                                            ஢ (⪠)
                                             
          ⠭     ⥭/   ⥫   
஦  0.  ⥫   ⮬ 砥  뤠 ᨣ TR00.  ஫
뢠 ᮤন ॣ PCN  ஢ ᨣ TR00  ⥫. 
  ᨣ      ஢,  ஫  ⠭  "1" ᨣ
ࠢ Dir  뤠   蠣    ⥫.    ᨣ  TR00
⠭  ᮪,  ஫  ⠭ 䫠 SE (Seek End)  ॣ
ST0  蠥 .  ᫨  ᫥  뤠  77  ᮢ  蠣  ﭨ
ᨣ    ,  ஫  ⠭  䫠 SE (Seek End)  EC
(Equipment  Check)    ॣ  ST0      蠥.    
ந  ४஢  ६    4-  ⥫.    
祧 ᨣ Ready  ⥫ 筠 ॠ樨   Seek.

 Sense Interrupt Status                          ﭨ 뢠
                          
      뢠 INT  ஫஬  ᫥  :
     1.  䠧 १ ᫥ :
          * Read Data
          * Read a Track
          * Read ID
          * Read Deleted Data
          * Write Data
          * Write Deleted Data
          * Format a Track
          * Scan Sommand
     2.  ᨣ Ready  ⥫
     3.    Seek  Recalibrate
     4.  䠧 믮  ० NON DMA
뢠       (1)    (4)    ᯮ  ஬,  ..
ந  ६ ଠ쭮  ᯮ  .    뢠  
  (2)    (3)      ஢  ஬ ⮫쪮 ⥬
믮  ⥭ ﭨ 뢠.   뢠 ᨣ
뢠    ।⢮  ⮢ 5-7 ॣ ST0   ।
稭 뢠.

             ͻ
              SE   INT Code                                   
             ͹                                 
                      稭 뢠            
               5    6    7                                   
             ͹
               0    1    1    ᨣ Readu         
                              ⥫                    
             ͹
               1    0    0   ଠ쭮 襭     
                             Seek  Recalibrate              
             ͹
               1    1    0   訡筮 襭      
                             Seek  Recalibrate              
             ͼ

      Seek  Recalibrate   䠧 १,  ⮬  ॡ
ᯮ짮    Sense  Interrupt Status   ᯥ譮 襭 
஢ન   ⥫ (PCN).

 Specify                                     ⠭ ࠬ ⥫
                                      
       祭 3 ६ ࢠ - ࠬ஢ ⥫:
     * HUT  -  㧠    ⢮ .   ६  砭 樨
               ⥭/   ⢮    孮 ᪠.
               ६          16 ᥪ.     ।
               16..240 ᥪ.
     * SRT   - ६  蠣  .     ६  প     
               ᫥⥫묨 ᠬ 蠣.  ६    
                1 ᥪ.     । 1..16 ᥪ.
               !  訥 ᫠  襥 ६ 蠣:
                             0FH - 1 ᥪ., 0EH - 2 ᥪ.  ..
     * HLT -   ६  .    ६    뤠祩  ᨣ
                         砫 樨 ⥭/.
                   2 ᥪ.    । 2..254 ᥪ.
      ६  ࢠ,  㪠  ,  易  ⠪⮢ ⮩
஫ (CLK,  .19)  ਢ  ,  CLK = 8  (203 .
).  ᫨   CLK = 4  (133 .  ),    祭 㬥  2
ࠧ.
      ND   ⢫ 롮 ०   ஫: ᫨ 
ND=1,  롨ࠥ ० NON DMA (-),  ᫨  ND=0,   롨ࠥ ०
DMA ().

 Sense Drive Status                              ⥭ ﭨ ⥫
                               
        ᯮ짮 ஬,   室 㧭
ﭨ ⥫.  ST3 ᮤন ଠ  ﭨ ⥫.

 Invalid                                                ⨬ 
                                                 
     ᫨   ஫  ।  ,           
襯᫥,  ஫ 蠥 .  ⮬ 砥 뢠 
.   6  7  ॣ ﭨ (DIO  RQM) ⠭  
1,  㪠뢠    室 믮 䠧 १ - ⥭
ॣ ST0.   ॣ ST0 室  80,  뢠騩  ⨬
.
     室 ⬥,      ᫥   権   Seek        Recalibrate
(   뢠   ᫥  砭  ),  ஫  
  Sense Interrupt Status,   ਬ ᫥ 
 ⨬.
     짮⥫   室    ᯮ짮    ,  
  NOP  ( 樨)  ਢ ஫  ⭮ ﭨ
  ﭨ  樨.
