Mirror your DOS screen - Terminate but Stay Resident (TSR) Source Code in C

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Home » C Home » Terminate but Stay Resident (TSR) Home » Mirror your DOS screen

A D V E R T I S E M E N T

Title	Mirror your DOS screen
Author	Harshvir Singh Sidhu
Author Email	hvssidhu [at] yahoo.com
Description	This is a TSR program which hooks itself with the timer interrupt and changes the current DOS screen with its mirror image i.e. character on the first line will be displayed on the last and on last will be displayed on first.
Category	C » Terminate but Stay Resident (TSR)
Hits	384336
Code	Select and Copy the Code
#include"dos.h" void interrupt (prevtimer)(); void interrupt mytimer(); void writechar(char ch,int row,int col,int attr); int ticks=0; int running=0; unsigned long far time=(unsigned long far) 0x46c; char far scr; char far* mode; void main() { if((mode &0x30)== 0x30) scr=(char far) 0xb0000000; else scr=(char far) 0xb8000000; prevtimer=getvect(8); setvect(8,mytimer); keep(0,1000); } void interrupt mytimer() { int i,j,k; char t[80]; ticks++; if(ticks==18) { ticks=0; if(running==0) { running=1; } for(i=0;i<25;i++) { for(k=0;k<=79;k++) { t[k]=(scr+i160+k2); } k=0; for(j=79;j>=0;j--) { writechar(t[k],i,j,7); k++; } } } running=0; (prevtimer)(); } void writechar(char ch,int row,int col,int attr) { (scr+row160+col2)=ch; (scr+row160+col*2+1)=attr; }

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