PNR_ARR
saved_packet = inb( ioaddr + PNR_ARR );
outb( packet_no, ioaddr + PNR_ARR );
outb( saved_packet, ioaddr + PNR_ARR );
packet_no = inb( ioaddr + PNR_ARR + 1 );
outb( packet_no, ioaddr + PNR_ARR );
packet_no = inw(ioaddr + PNR_ARR) >> 8;
outw(packet_no, ioaddr + PNR_ARR);
int saved_packet = inw(ioaddr + PNR_ARR) & 0xff;
outw(packet_no, ioaddr + PNR_ARR);
outw(saved_packet, ioaddr + PNR_ARR);