ULTRA_ENB
ultraenb = (ahc_inb(ahc, ULTRA_ENB + 1) << 8)
| ahc_inb(ahc, ULTRA_ENB);
ahc_outb(ahc, ULTRA_ENB, ultraenb & 0xff);
ahc_outb(ahc, ULTRA_ENB + 1, (ultraenb >> 8) & 0xff);