Assignment No. 02 Semester: Spring 2012 CS609: System Programming

[sanam]

Code:

#include <dos.h> #include <bios.h> #include <conio.h> void initialize (unsigned int far *com) { outportb ( (*com)+3, inport ((*com)+3) | 0x80); outportb ( (*com),0x60); outportb( (*com) +1, 0x00); outportb ( (*com)+3, 0x02); } void SelfTestOn(unsigned int far * com) { outportb((*com)+4,inport((*com)+4)|0x10); } void SelfTestOff(unsigned int far * com) { outportb( (*com)+4, inport((*com)+4) & 0xEf); } void writechar( char ch, unsigned int far * com) { while ( !((inportb((*com)+5) & 0x20) == 0x20)); outport(*com,ch); } char readchar( unsigned int far *com) { while (!((inportb((*com)+5) & 0x01)==0x01)); return inportb(*com); } unsigned int far *com=(unsigned int far*) 0x00400002; void main () { char ch = 0; int i = 1;int j= 1; char ch2='A'; initialize( com); SelfTestOn(com); clrscr(); while (ch!=64) { if (i==80) { j++; i=0; } if (j==13) j=0; gotoxy(i,j); ch=getche(); writechar(ch,com); ch2=readchar(com); gotoxy(80-i,j+14); putch(ch2); i++; } SelfTestOff (com); }