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TSR Program Example 2============================================.model tiny

code_seg segment 'code'assume cs:code_seg

main proc far.startup

jmp codepart

oldint8 dd (?)oldint15 dd (?)nvalue dw 0741htik db 0h

dhr db 0hdmin db 0h

dsec db 0h

s1 db ?s2 db ?m1 db ?

m2 db ?h1 db ?

h2 db ?hid db 07h

pos dw 0010d

codepart:

xor bx,bx

xor ax,axmov ah,2chint 21h

mov dsec,dhmov dmin,cl

mov dhr,ch;for clrscr

mov ax,0B800hmov es,ax

mov di,0

mov cx,2000dstart: mov word ptr es:[di],0720h

add di,2loop start

xor ax,ax;for int15a

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mov ax,0

mov es,axmov ax,word ptr es:[15h*4]

mov word ptr cs:oldint15,axmov ax,word ptr es:[15h*4+2]

mov word ptr cs:oldint15[2],ax

mov word ptr es:[15h*4],offset newint2mov word ptr es:[15h*4+2],cs

;for int 8mov ax,0

mov es,axmov ax,word ptr es:[8*4]

mov word ptr cs:oldint8,axmov ax,word ptr es:[8*4+2]

mov word ptr cs:oldint8[2],ax

mov word ptr es:[8*4],offset newint

mov word ptr es:[8*4+2],cs

mov ax,3100hmov dx,1000int 21h

main endp

newint2 proc

cmp ah,4Fh

jne skipall

;chk right arowcmp al,4DH

je body1;chk down arow s

cmp al,50h

je body2;chk up arow wcmp al,48h

je body3;chk left arow a

cmp al,4Bhje body4

;chk hide key h

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cmp al,23h

je body5;chk unhide key s

cmp al,1Fhje body6

jmp skipall

body1:add pos,2d

jmp skipallbody2:

add pos,160djmp skipall

body3:

sub pos,160djmp skipall

body4:sub pos,2d

jmp skipallbody5:

mov hid,00hjmp skipall

body6:mov hid,07h

skipall:

;for clrscr

mov ax,0B800hmov es,ax

mov di,0mov cx,2000d

start1:

mov word ptr es:[di],0720hadd di,2loop start1

jmp dword ptr cs:oldint15newint2 endp

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newint proc

push espush ax

xor bx,bx

xor ax,ax

cmp tik,12hjne isec

mov tik,0hadd dsec,01h

cmp dsec,3Ch

jne isecmov dsec,00h

add dmin,01h

cmp dmin,3Ch

jne isecmov dmin,00h

add dhr,01h

cmp dhr,18hjne isecmov dhr,00h

isec:add tik,01h

;secmov al,dsec

mov bl,10d

div bladd ax,3030h

mov s1,almov s2,ah

;minute

xor bx,bxxor ax,axmov al,dmin

mov bl,10ddiv bladd ax,3030hmov m1,al

mov m2,ah

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;Hourxor bx,bx

xor ax,axmov al,dhr

mov bl,10ddiv bladd ax,3030hmov h1,al

mov h2,ah

mov di,posmov ax,0B800h

mov es,axXOR BX,BX

mov bx,0741h

mov bh,hid;dis hr

mov bl,h1mov word ptr es:[di],bx

mov bl,h2mov word ptr es:[di+2],bx

;dis spacemov word ptr es:[di+4],0720h

;dis minutemov bl,m1

mov word ptr es:[di+6],bxmov bl,m2

mov word ptr es:[di+8],bx;dis space

mov word ptr es:[di+10],0720h

;dis secmov bl,s1

mov word ptr es:[di+12],bxmov bl,s2

mov word ptr es:[di+14],bx

pop axpop es

jmp dword ptr cs:oldint8newint endpcode_seg endsend

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