#include <stdio.h>
#include <dos.h>
#define PRINTER 0x17	//BIOS printer port
#define LPT1 0x00		//LPT1, your first printer
#define EJECT 0x0c		//Eject page printer command

void eject(void);
void prnchar(char c);

void main()
{
	printf("Please ensure that your printer is on and ready to print.\n");
	printf("Press Enter:");
	getch();

	prnchar('T');		//print "Testing" on the printer
	prnchar('e');
	prnchar('s');
	prnchar('t');
	prnchar('i');
	prnchar('n');
	prnchar('g');
    eject();			//spew out the page

}

void eject(void)
{
	prnchar(EJECT);
}

void prnchar(char c)
{
	union REGS regs;

	regs.h.ah=0x00;		//print character function
	regs.h.al=c;		//character to print
	regs.x.dx=LPT1;		//printer port to print to
	int86(PRINTER,&regs,&regs);
}