                             - 228 -

                  5.    .

         -    -
      .     
    ,     
.           .
        -
 .
     ,        -
           
         .  
     ,  
        .  
            
  .      
      " ";   
     ,       .
,           
    [4.5.3].       ,  
        .

                             - 229 -

   4.5.1    .

        ,     2-  
25-      1-   24-,   
    25- .     , 
     ,      -
  .    .

    .

            -
.        -
   ,     ,  
   10H,          
.         
.         -
      .        
            
,        0  24   0   79.
  ,     : 
    (6  7, ),      
 ( 0,    )     
   ( "" - 7).     
 .       
  ,     .

100 '''  
110 DATA &H55, &H8B, &HEC, &H8B, &H76, &H12, &H8A
120 DATA &H24, &H8B, &H76, &H10, &H8A, &H04, &H8B
130 DATA &H76, &H0E, &H8A, &H2C, &H8B, &H76, &H0C
140 DATA &H8A, &H0C, &H8B, &H76, &H0A, &H8A, &H34
150 DATA &H8B, &H76, &H08, &H8A, &H14, &H8B, &H76
160 DATA &H06, &H8A, &H3C, &HCD, &H10, &H5D, &HCA
170 DATA &H0E, &H00
180 '''    &H2000
190 DEF SEG = &H2000      '    &H2000
200 FOR N = 0 TO 43       '44 
210 READ Q                '  
220 POKE N,Q              '   
230 NEXT                  '

300 ''' 
310 GOSUB 500             '  
320 LOCATE 1,1: PRINT TEXT$(LINEPTR);  '  

500 ''' 
510 DEFINT A-Z            '  
520 TLR = 0               '  
530 TLC = 0               '  
540 BRR = 24              '  
550 BRC = 79              '  
560 NUMROWS = 1           '  
570 DIR = 7               '  
580 FILL = 7              '  
590 DEF SEG = &H2000      '  
600 SCROLL = 0            '  1- 
610 CALL SCROLL(DIR,NUMROWS,TLR,TLC,BRR,BRC,FILL)
620 RETURN                ' 

                             - 230 -

    .

     6  10H     , 
 7 - .    AL    ,
   AL = 0,    ,   .   CH:CL
       ,  DH:DL - -
     .    -  
         BH.

;---    
   MOV  AH,6      ;   
   MOV  AL,1      ;  
   MOV  CH,0      ;   
   MOV  CL,0      ;   
   MOV  DH,24     ;   
   MOV  DL,79     ;   
   MOV  BH,7      ;  
   INT  10H       ; 

    .

           , -
           
  .     
160      (80    * 2   -
)        .   
      ,    
  ,       , 
     PCjr.      
[4.3.1].        -
  ,         .   
 ,     
    .
              
  ,     .  "
" ,       -
 ,        .   
   BIOS,  .   
     ,    -     ,  
 .
              
  3     3D8H.       1
   .      -
      .  
    ,    
  ,      3   -
  .         -
     (  [4.1.2]).
  PCjr            1
  .  [4.1.1]      
  .

                             - 231 -

   4.5.2    .

         
 ,      .   
       .    
        -   -
.   ,   ,   -
     5 .     5   ,
    ,     5 
   .       
  ,         10
  ,       ,  
 5           5
  .   ,    -
   5 ,    5    
  .       -      5
.          
  [4.5.1],       
               0
.  4-6   .

    .

         5  .  
           
.        
    .

;---    10 
      MOV  AX,0B000H      ;   
      MOV  ES,AX          ;
      MOV  DS,AX          ;
      MOV  SI,10          ;  SI ...
      MOV  DI,0           ;...  DI
      MOV  CX,1995        ;    5 
REP   MOVSW               ; 
;---  
      MOV  AH,6           ;  
      MOV  AL,0           ;  0   
      MOV  CH,0           ;   
      MOV  CL,75          ;   
      MOV  DH,24          ;   
      MOV  DL,79          ;   
      MOV  BH,7           ;   
      INT  10H            ; 

                             - 232 -

   4.5.3    .

     ,    , 
      ,   
      ,   
     .   ,   -
     ,        
  .         
       .   
:

                              

     0              8               B800
     1              8               B800
     2              8               B800
     3              8               B800
     4                    1               B800
     5                    1               B800
     6                    1               B800
     7              1/8             B800
     8                          B800
     9                          B800
     A                          B800
     D                   2/4/8            A000
     E                   1/2/4            A000
     F                    1/2             A000
    10                    1/2             A000

  8-A -   PCjr;      -
    ,    
 .    2K  4K  -
 , 32K -         
 16      16K -   
.   D-10  EGA.    -
     .   F  10 -
    128K .  7   -
     8   EGA.
            -
.     ,     
        .      
          
        ( 
B000:0000).             
"".         ,
      ,      
   .
          ,  -
        . 
       ,     -
   .    ,   -
     " ",    
    .      ,
      ,   -
    .  BIOS      
 , ,     
 .       0  7.  
   0040:0062.

                             - 233 -

    .

        SCREEN   ,  
    ( )   
(  ).     0  3   
80      0  7  40-.  -
       SCREEN        .
SCREEN,,2   ,    PRINT  
  2.      -
.  SCREEN,,,1     ,      
 1.      ,   -
 ,     .
          PCjr  -
 CLEAR.        ,
   ,     16384 .
               16K,   
CLEAR,,,32768.      4096 
.     ,        ,
  SCREEN        -
 .   PCjr     
SCREEN,    (..     ).
      .    PCOPY  
  PCjr.          
.  , PCOPY 2,1    2  -
 1.
            ,
           "".
         
    .        
       -
.            .   (
          
    .)
         4000   -
,  ,      . 
         &H2000,   
   &H2200.        
9-  10-          .
,    &H2000     &H00, &H20  
DATA.    ,      
  .     ,  
 1234:0000,     9  10  &H34, &H12.
              
,      .      230-260 
       (ASCII 32)   
 (32  ""   ).   
      ,    
  .     ,    -
    ,   -
  .

                             - 234 -

100 ''' 
110 DATA &H1E, &H06, &HB8, &H00, &HB0, &H8E, &HC0
120 DATA &HB8, (3&H00, &H20), &H8E, &HD8, &HBF, &H00
130 DATA &H00, &HBE, &H00, &H00, &HFC, &HB9, &HD0
140 DATA &H07, &H26, &H8B, &H1D, &HAD, &HAB, &H89
150 DATA &H5D, &HFE, &HE2, &HF6, &H07, &H1F, &HCB
160 '''   
170 DEF SEG = &H2200   '  
180 FOR N = 0 TO 34    '   
190 READ Q             '  
200 POKE N,Q           '   
210 NEXT               '
220 ''' 
230 DEF SEG = &H2000   '  
240 FOR N = 0 TO 3999  '    
250 POKE N,32          '  32
260 NEXT               '    

500 '''   
510 DEF SEG = &H2000   '   
520 S$ = "PSEUDOPAGE"  '   
530 M = LEN(S$)        '  
540 FOR N = 1 TO M     '   
550 POKE N*2+2000, ASC(MID$(S$,N,1))   '   
560 NEXT               '

600 '''  
610 PRINT "SCRREN 1"   '   
620 DEF SEG = &H2200   '  
630 PSEUDOPAGE = 0     '   
640 CALL PSEUDOPAGE    ' 
650 CALL PSEUDOPAGE    ' 
660 ...

    .

    5  10H     
.       AL:

;---  
   MOV  AH,5       ; 
   MOV  AL,2       ;  (  0)
   INT  10H        ; 

        ,   
  .     BIOS,     
(  10H),      
        .    
    MS  DOS     -
.    ,  ""     
  10H.
              
  F   10H,       .
      BH.

                             - 235 -

    .

           -
,       .     
   12 ( )  13 (
)   6845,     
.      , -
  B800 :

                       40             80 

    0             0000H                  0000H
            1             0400H                  0800H
            2             0800H                  1000H
            3             0C00H                  1800H
            4             1000H
            5             1400H
            6             1800H
            7             1C00H

  [4.1.1]        
6845,   [4.5.4]      
.          BX    
   .   ,   -
   .     -
          
            -
.
            ,
          -
.      4000     .
        -
 ,        
 ,     .  -
     .

;---  
PPAGE  DW   2000  DUP(720H)  ;  

;---    
            MOV  AX,0B000H   ;  
            MOV  ES,AX       ;
            MOV  AX,SEG PPAGE  ;  
            MOV  DS,AX       ;
REPEAT:     MOV  DI,0        ;DI   
            MOV  SI,OFFSET PPAGE  ;SI   
            CLD              ; 
            MOV  CX,2000     ;  2000 
NEXT_WORD:  MOV  BX,ES:[DI]  ;     BX
            LODSW            ;    AX
            STOSW            ;  AX  
            MOV  DS:[DI]-2,BX  ;  BX  
            LOOP NEXT_WORD   ;

   PCjr         3DFH. 
   :

    2-0      ( 0  7)
        5-3      ( 0  7)  
                 B800H
        7-6   = 00    
              = 01     16K
              = 11     32K

                             - 236 -

   4.5.4    .

            -
,         
.            
   .      -
   ,        
  .       -
.
              
 ,    ,    
,         -
.   80       ""    
 ,   80 -    .    40
     80    40.  
. 4-7    .
   ,         -
,        -, 
    .   ,  
           (96 
 80-   48    40-
)  6845      -
      .   
  ,      
  ,     
   .
   BIOS            
     .      
   0040:004EH.

    .

         12 ( )  13
( )  6845.  [4.1.1]   
.             
  3D5H,         
 3D4H.          -
.  START_ADDRESS     -
   .

   MOV  BX,START_ADDRESS  ;   
   ADD  BX,80             ;  1  (80 )
   MOV  DX,3D4H           ;   
   MOV  AL,12             ;  12
   OUT  DX,AL             ; 
   INC  DX                ;    
   MOV  AL,BH             ;   AL
   OUT  DX,AL             ;    12
   DEC  DX                ;   
   MOV  AL,13             ;  13
   OUT  DX,AL             ; 
   INC  DX                ;  
   MOV  AL,BL             ;   AL
   OUT  DX,AL             ;   13