EN0_TSR
unsigned char txsr = inb_p(e8390_base+EN0_TSR);
int status = inb(e8390_base + EN0_TSR);
txsr = inb(e8390_base+EN0_TSR);
txsr = ei_inb(e8390_base+EN0_TSR);
unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
int status = ei_inb(e8390_base + EN0_TSR);