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  1 ;98   z.bin
  2
  3 code segment
  4         assume cs:code,ds:code
  5         org 100h
  6
  7 begin:
  8         jmp install
  9         d1 db 'z'
10         old dd ?
11         c db 0
12         color db 0
13         pag db ?
14         line_23 db 10 dup(20h,0)
15         line db 'Z',0eh,'B',0eh,'.',0eh,20h,0
16         line_24 db 2 dup(20h,0ah,20h,0ah,':',8eh),20h,0ah,20h,0ah
17 start:
18         inc cs:[c]
19         cmp byte  ptr cs:[c],8
20         je n1
21         jmp dword ptr cs:[old]
22 n1:
23         mov byte ptr cs:[c],0
24         push ax
25         push bx
26         push cx
27         push dx
28         push ds
29         push es
30         push di
31         push si
32
33         cmp byte ptr cs:[color],15
34         jae n3
35         inc cs:[color]
36         mov bh,cs:[color]
37         mov byte ptr cs:[line+1],bh
38         mov byte ptr cs:[line+3],bh
39         jmp n4
40 n3:
41         mov byte ptr cs:[color],0
42 n4:
43         mov ah,0fh
44         int 10h
45         ;     mov ah,3
46         ;     int 10h
47         ;       push dx
48         mov cs:[pag],bh
49         mov ax,0b800h
50         mov es,ax
51         ;       mov ax,4096
52         ;      mov bh,pag
53         ;      mul bh
54
55         ;        mov di,ax
56         ;      add di,140
57         mov ax,cs
58         mov ds,ax
59         ;      lea  si,line_23
60         cld
61         ;      mov cx,20
62         ;     rep movsb
63         mov ah,2
64         int 1ah
65         push cx
66         mov ah,ch
67         mov cl,4
68         shr ch,cl
69         add ch,30h
70         mov byte ptr cs:[line_24],ch
71         mov ch,ah
72         and ch,0fh
73         add ch,30h
74         mov byte ptr cs:[line_24+2],ch
75         pop bx
76         mov ah,bl
77         shr bl,cl
78         add bl,30h
79         mov byte ptr cs:[line_24+6],bl
80         and ah,0fh
81         add ah,30h
82         mov byte ptr cs:[line_24+8],ah
83         mov ah,dh
84         shr dh,cl
85         add dh,30h
86         mov byte ptr cs:[line_24+12],dh
87         and ah,0fh
88         add ah,30h
89         mov byte ptr cs:[line_24+14],ah
90         mov ax,4096
91         mov bh,pag
92         mul bh
93         mov di,ax
94         add di,134
95         lea si,line
96         mov cx,24
97         rep  movsb
98
99         ;     pop dx
100         ;     mov bh,pag
101         ;     mov ah,2
102         ;     int 10h
103         pop si
104         pop di
105         pop es
106         pop ds
107         pop dx
108         pop cx
109         pop bx
110         pop ax
111         iret
112 install:
113         mov ax,351ch
114         int 21h
115         mov word ptr old,bx
116         mov word ptr old+2,es
117         mov si,80h
118         cmp byte ptr cs:[si],0
119         je next
120         cmp byte ptr es:[103h],'z'
121         jne error
122         push ds
123         push dx
124         push di
125         cli
126         lea di,old
127         mov ds,word ptr es:[di+2]
128         mov  dx,word ptr es:[di]
129         mov ax,251ch
130         int 21h
131         sti
132         pop di
133         pop dx
134         pop ds
135         mov ah,49h
136         int 21h
137         jmp eexit
138 error:
139         lea dx, mess
140         mov ah,9
141         int 21h
142 eexit:
143         mov ah,4ch
144         int 21h
145 next:
146         mov ax,251ch
147         lea dx,start
148         int 21h
149         lea dx,install
150         int 27h
151         mess db '      the TSR program no find!$'
152
153         code ends
154         end begin
155