//---------------------------------------------------------------
// EXAMPLE EX1.C :  Basic Template of a C Program
//
// C.P. Diduch, Dec 1999.
//---------------------------------------------------------------
#include <conio.h> 	// conio.h contains prototypes for 
			// inportb() and outportb(). 
//---------------------------------------------------------------
void main()
{
unsigned char X, Y;

outportb(0x13E, 0x82);	// Initialize 82C55A PPI with ports 0x138
			// and 0x13C as OP ports and port 0x13A
			// as an IP port.
X = 0x3F & inportb(0x13A);
Y = X ^ 0x0F;
outportb(0x13C, Y);
}