INTR_MASK_REG_B
outb(BASE + INTR_MASK_REG_B, 0x00);
outb(BASE + INTR_MASK_REG_B, 0x00);
outb(BASE + INTR_MASK_REG_B, mask);
mask = inb(BASE + INTR_MASK_REG_B) | IM_ALLOC_INT;
outb(BASE + INTR_MASK_REG_B, mask);
mask = inb(BASE + INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
outb(BASE + INTR_MASK_REG_B, mask);
mask = inb(BASE + INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
outb(BASE + INTR_MASK_REG_B, mask);
mask = inb(BASE + INTR_MASK_REG_B);
outb(BASE + INTR_MASK_REG_B, 0x00);
mask |= inb(BASE + INTR_MASK_REG_B);
outb(BASE + INTR_MASK_REG_B, mask);