L4_SELECT_DIGITAL
outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
outb(L4_SELECT_DIGITAL + card_no, L4_PORT);
if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no)
outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);